OK, here's the way it is:
An associate had a iMac 350 (slot-load, Rev.E, whatever) that suffered flyback death. He was going do the ATX conversion, got halfway, and then was bored/fed up/done with it. He offered it to me.
I have the case, the motherboard, and what he claims is the start of the ATX power board. (I'll have pics later).
This is primarily going to be used as the way that I document my progress. I would really appreciate any suggestions, advice, or comments.
I am not necessarily electrically inclined, so the power board thingiemabob looks like an alien life form to me. It could be that my associate did not know what he was doing, or maybe that he was using the instructions for the Rev.A-D iMacs. Or I'm just an idiot.
I'll update y'all later.