How hard would this be?

[Edward78]

I have a idea, to put a PC in a Xbox one case. mITX mb with the gpu laying flat, would be nice to find a small PSU io go right by the MB also. It would make a great looking small pc. The detentions seem workable. The Xbox One has a height of 3.1” (78.7 mm), width of 13.1” (332.7 mm), depth of 10.8” (275 mm)

 

[Edward78]

Have seen people do it
Using amd G series cpus

Also seen it done watercooling the cpu and gpu
Though the gpu had to be mounted
On top of/outside the case
Using a riser cable

Not sure if you could squeeze a modern gpu internally
They're relatively large if want good gpu
Processing power

New 8700g cpus look to be ideal
Though for doing it with reasonable graphics power
Coming solely from the gpu

A 2 slot gpu is around 2 inches right?