Sharepoint 2013 foundation cascading lookup multiple choices

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jQuery

SharePoint2013

foundation

I am trying to create cascading lookup columns in my library.

I have already tried to use a jquery solution: Two Level Cascading Drop Down in SharePoint 2013 using SPServices, but didn't find a working answer for the foundation version. I know a good solution would be to choose a paying version, unfortunatelly that is out of the question.

The goal is to be able to choose one or more of those people whom are linked to the former chosen platform, this to evite people from having lists with too many items.

In some other cases I will also need to use cascading lookup columns (only one choice)

Unfortunatelly I am not a programmer, so please be rather complete with the provided code.

tables for lookup columns and library