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If you want to go to so much detail...
No, I did not ohm tested.
But I anticipated that static electricity might build up so I kept the string away from any electronics, plastics, and other strings.
I added long screws to the usual mount points of the motherboard and the string strapped to those, on both sides of the motherboard to avoid bending due to too much tension on just one side. Used a similar setup for the HDDs.
Also connected those screws to the case of the PSU with copper wire (insulated obviously) to establish the connection they usually have in a normal ATX chassis. So, effectively, those connections were grounded. Tip: some motherboards fail to boot if those points are not properly grounded.
I approached the build as a suspended cable bridge project where the motherboard and the HDDs are part of the deck, floating in the air but at the same time secure and without excessive vibration (that in bridges can lead to collapses).
So, anticipating that the strings might come loose due to the vibrations (because cotton stretches more than metal) I stress tested a single string with the double of the maximum length I would need to find how many I would have to use per cable (one cable per mount point) so that stretching was imperceptible. Then I built braided cables with the double of that amount. I did not use plain string to secure things.
Those cables had a hole near the middle that could be used to twist them to increase the tension if they ever got loose and, anticipating moister, those holes were also used to hold desiccant bags.
On the points the string cables attached to the mount points I used electrical tape to prevent tearing on the screws threads. Also used electrical tape to bound the strings together and prevent the cables from unwinding.
That setup lasted two years and then laptops started to become cheap enough and powerful enough so I replaced this setup with a laptop.
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Got a desk with drawers on one side, and a box (closet?) on the other one. Box is four drawers high. Mounted a mini-PC motherboard in it. Passive cooling, very silent.
The current PC doesn't fit; a monster of a machine built by a gamer. I still miss that old mini-PC though. In terms of performance, it outran many full sized desktops.
Remember I said passive cooling? It burnt in a summer three years ago, scorched the desk.
I was proud of it, and consider it my "best" machine. The worst, could have burnt down the house.
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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There are desks like that although most have the computer under a glass on the top and are made of metal. Search "computer desk case" and you may find something.
Passive cooling anything needs to be in a place that is naturally well ventilated, preferably with a very small draft (imperceptible by humans). That is the little information that manufacturers held back or most people would not buy them. If it is not in a naturally well ventilated place, it will eventually burn. In the best case scenario it just stops working.
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Enclosed in wood, it burns. And those desks expensive.
Bastard Programmer from Hell
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Quote: In terms of performance, it outran many full sized desktops.
It's not the size of the box, it's how you use it. 
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Back when I was in high school, I had a woodworking class and had spent a considerable amount of time thinking about designing a desk where the desk itself would be the chassis. I never went through with it however (which is probably for the best).
The idea I had was that both front legs would essentially be enclosed cabinets with enough room to fit a motherboard and a bunch of peripherals; the back legs would've had power outlets running the full vertical length, essentially acting as extra-long power strips. Holes for fans, sliders for hot-swappable drives with front access...let your imagination run wild.
I figured it would've been a heat trap, so it would've had a ton of fans. Which of course means the whole thing would've been noisy. Again...probably a good thing it never progressed any farther than a thought in my mind...
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Yeah, I made that mistake and got scorchmarks in my desk to prove it.
You need ventilation and it'll work. No passive cooling if you use anything wood. My worst idea ever 
Bastard Programmer from Hell
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Just the other day I was told of a friend's mishap: the power supply in his chassis was a bit bigger than expected and the motherboard wouldn't fit. He cut a corner of the motherboard to make it fit.
Quote: Don't force it, get a bigger hammer.
Arthur Bloch
Mircea
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honey the codewitch wrote: When I was young I put a 286 mobo and MFM HDD (remember those?) inside a cabinet with wood screws.
I put a Commodore PET in a wooden box once. Not sure why, it was rather flimsy.
Also, I used to work on various ROM "extensions" for the PET, so I had this PCB where I plugged in the ROM's and wired up two external multi-position switches for the $A000 and $B000 (or something like that) ROM select lines.
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OK, not a computer chassis, but a hack nonetheless...
Way back in the mid 80's, I bought a new Korg synthesizer. It had inputs for 3 pedals:
0: Naturally, a sustain pedal
1: A switch to advance to the next programmed sound
2: A volume pedal
I couldn't afford the factory pedals, so I made my own with parts from Radio Shack, a few old pieces of wood, springs, some string, and a few girders and pulleys from my old childhood Erector set!
The sustain and program advance switches were easy, but the volume pedal took some engineering so that it would rotate a rheostat using the string.  It worked until I could afford better equipment!
"Go forth into the source" - Neal Morse
"Hope is contagious"
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Not computer hack, but nevertheless worth mentioning:
A fellow student of mine bought a used car really cheap. One problem was that while driving, the shift box frequently slipped from the selected gear into neutral, disengaged, loosing all power.
So my friend bought a couple of neodymium magnets, gluing one to his shift stick, the other one to the dashboard. This was enough to keep the speed stick in position, keeping it from flipping back to neutral.
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To err is human. Fortune favors the monsters.
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Another car hack (referring to the above one) from the student days:
One of my fellow students broke the multi-function handle of his car - the handle only, none of the switches. The handle itself couldn't be bought separately, you had to buy the entire box with all the switches, at a cost that was a fortune on a student budget. So he rather bought a tube of super-glue, gluing an old toothbrush to the remains of the old handle. For years, we saw him flipping his old toothbrush up and down, forwards and backwards, and twisting it around, serving all the functions that the old handle did before he broke it.
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Was it one of the toothbrushes that had the little pick on the end?
Or he messed up and used the end with the bristles?
Too funny. Great description.
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Windows for Workgroups 3.1 came pre loaded with networkable Hearts, the card game for up to four players. We took a left over chassis that had dual floppies. Hacked enough of the OS and game across the 2 floppies (total of 2.4 Mb) to be able to boot it and join the game. Never bothered to put the case back on in case we wanted to scavenge serial port cards or the monochrome monitor card.
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I approve of this.
To err is human. Fortune favors the monsters.
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Not a chassis hack, but a peripheral hack.
The Commodore 64 joystick had 4 contact switches for directions and 1 for the button.
There was a Track and Field game where you just had to move the joystick Left Right Left Right to run the 100M dash.
I made a custom joystick adapter using the little spring connectors from a Radio Shack project board so I could wire any switch into the joy stick port.
I finally set the âworld recordâ using the Fan On/Fan Automatic switch from an old thermostat. Very clean connection on a very short lever.
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Well, there was that abacus that I had to bind together with twine made from flax, because the granite beads were too heavy for the sabre-tooth ivory frame.
But then I am bit older than a lot of you.
Nothing succeeds like a budgie without teeth.
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That sounds like something a particular friend of mine might say.
Mark, is that you?
To err is human. Fortune favors the monsters.
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honey the codewitch wrote: Mark, is that you?
Sadly, no.
Nothing succeeds like a budgie without teeth.
To err is human, to arr is pirate.
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oh man... where to start.
When I was at university I had a 486 Motherboard hanging from the celling using fishing-wire and a huge desk fan blowing air on it to keep it cool (This was largely in the days before most CPU's had coolers on top, and a lot where still passive), I had to keep it cool because I'd overclocked the 66Mhz 486 DX 2 I had in it to something like 80Mhz.
I've built cases from Lego, changed airflow technology's and ducting using tea-bag boxes and cereal cartons, and during my 4 and a half years as an engineer for Orange UK, you don't want to know how many bare systems where glued into racks in data centre's using "No More Nails", when on a 4AM call out and no spares where available!
Right now in my rack up in the loft is a couple of AMD servers that are basically just bare boards sat on a piece of cloth (To prevent shorts) and propped up in the rack on those bus bars you have for connecting patch leads
Still Crazy (Best and only way to be!)
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Apparently you're the reason I asked the question about hacks. This is what I was hoping for. Well done!
To err is human. Fortune favors the monsters.
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LOL...
I've had many accolades over the years, but that ones a first!
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Stick a box fan under it meanwhile.
Where I worked for a while a couple decades ago, we always built our own computers for client jobs, and it was normal for us to always have computers sitting around that consisted of everything screwed to a piece of plywood or foam core board or stiff cardboard or whatever was around for testing before we committed to the components we were going to put together in the boxes, in addition to having some that we already assembled to test them already built. Not quite pizza boxes, though. That's a good one! Personally, though, I just use some old towers that I keep around and just put together new stuff in them.
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