MacMini Cube Mod

I decided that I'm going to take my hand at modding and I've always thought that the PowerMac G4 Cube was awesome and I want a new desktop computer, so why not combine them?
Things I currently need to buy:
PowerMac G4 Cube Case
MacMini Core Solo/Duo
Intel Core 2 Duo 2.0GHz (T7200)
2GB RAM
(tentative) 3.5" 500GB 7200RPM Hard Drive
(if not the 3.5") 2.5" 120GB 5400RPM Hard Drive

I only have $100 currently, but I'm looking to sell my PSP for $200 and my birthday is coming up next month. This mod will roughly cost $1100, I know it's been done before, but it'd be fun to do it and have a cool looking desktop computer (not to say the MacMini doesn't look cool, but the Cube looks better).

I also want to keep the power button of the Cube, because it's awesome. I'll update the thread as the things fall into place. But I do have a couple questions, how do I have the power button of the Cube work with the Mini inside of it? And would a 3.5" Hard Drive work inside, instead of the 2.5" of the mini?