Thought I'd post my Mac Classic case mod here.
It's almost complete, just got to put the headphone and hdmi ports in.
Spec wise it's a little dated, it's specs are:
Zotac 9300 wifi motherboard
Geforce 9300 (overclocked to 9400)
Apple Airport Extreme via pcie adapter
iMate ADB adapter
1024x768 display behind original crt front
Internal usb powered speaker
I've managed thus far not to cut the case, but I probably will have to for hdmi out. It'll probably go in the lock port without too much effort.