I can see you putting a g3 or a g4 in ther, but dude! Please keep the peecee in its natural habitat (the trash can)!!!! I even put another computer in a surplus G5 case I got my hands on, but it was still a mac (a g3 yosemite to be exact)
Mobile-2.2Ghtz Core 2 Macbook, 4GB ram, 160GB HDD
Server-Dual 1.42 MDD G4, 1GB ram, 4 random hard drives.
PC-C2D 2.4Ghtz, Asus Commando, 2Gb ram, 3 hdd's in raid 5, 8800GTS.