Can't wait to see what it looks like after you're finished. I will be looking on ebay tonight for a Rev A/B iMac G5. I just hope I can find one for a reasonable price, but I'm sure it won't be too much trouble to find one. I think my mom will like this much better than the mini and the cables being everywhere.
Are you going to be using a BT keyboard/mouse for it? I'm not sure which would be better, however, the least amount of wires the better.