I'd be interested in something like this as well. I'm not much for cutting up our elegant macs, but some info can be really helpful. I have swapped out all the fans and drives in my G4, it is much, much quieter (ie, you can't hear it from 10 feet away unless the drives are writing data)...some stuff like enclosures, etc would be good too. I found out too late that the prolific chipset won't allow booting under OS X...

My mistake though, not enough research.
Oh well. I do think a forum for modding or just improving might get some interest. There is a site called macmods or something like that but it seems kinda cheesy what some are doing...like 10 HDD's in your G5 or a big old fan bolted to the top of your quicksilver...
later
Tim