Well, after a bit of hacking around I got a GeForce 2 MX to fit nicely inside of a PowerMac G4 Cube. See?

Click for more…
Just for reference, this is a Dell OEM Nvidia GeForce 2 MX combined with cutdown pieces of the original heatsink from a Netpliance I-Opener.
off subject
but i love the doggie case :)