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It's writing the "something like powershell" that would be the bugger.
Bear in mind that you'd have to keep rewriting segments of it, largely because of sudden realisations like "Oh, it needs to do this, too, but not in the way it's doing it now". With 3,000 changes a month, it might do a tenth of what you need it to do, within a year.
Even DOS took a couple of man-centuries to write. Granted, they didn't have the tools we have now, but it didn't have to do a hundredth of what an OS has to do now.
I'd recommend staying away from the keyboard for at least six months -- unless it's to annotate diagrams and write pseudocode and use cases.
Oh, and remember to do the most important thing first -- create the graphics infrastructure that will allow you to run an icon editor.
I wanna be a eunuchs developer! Pass me a bread knife!