A:Answer Okay, tried measuring the best I could. I rounded down a bit to give myself some wiggle room.
The side doors are:
Width: about 9.5 inches
Height: about 15.5 inches
Depth: about 18 inches
There's also no holes in the back, but the back is just screw-on thin plywood. Would be easy to make a hole (or just leave the plywood off during assembly).