Hubby made this cabinet in workshop class about 30 years ago or so. It's made of solid oak and it looks like it's still new. The middle is 20 inches wide and about 35 inches tall. Not sure how tall the bottom is. There is a top shelf, but I have chicken stuff up there. My plan is to nail a piece of particle board to the back and put a divider in the middle. I'm going to leave the bottom part alone and keep the one side door on. Is 10 inches too narrow for the nest box or will the nest box be too tall? Or will we need to make the standard 12x12 nest box out of wood? We do have the materials to make nest boxes, but since we had this laying around I thought it might work. Thanks in advance.