I'll look for those pots...
In the mean time I think this would be one of those projects only worth doing for the fun of it. Obviously I'd rather have a Power Mac or a Mini with 64Mb of video RAM, but if I could re-case this, I'd consider keeping it and then later just registering a second copy of MorphOS for another Mac.
My problem at is finding connectors that plug into the eMac mother board so that I can make some adapter cables.