Reminds me very much of my college project where my roommates and I repackaged a Commodore 64 into an IBM PC form factor, complete with external keyboard.
Difficulty: College was in a town without a Radio Shack, and none of us had cars.
I think I've seen such a conversion, and am now frantically searching for it but with all the wrong keywords it seems!
There was also a "shucked" 1541 PCB and drive fitted in the top section of a tower case and IIRC in the post I've read they have served all power demands either from a standard PSU or an off-the-shelf power supply module.
Difficulty: College was in a town without a Radio Shack, and none of us had cars.