Thanks everyone for your suggestions! My co-worker is building it for free and he has put A LOT of time and energy in it so I feel pretty guilty asking him to make major modifications, so I'll try to do them myself if the need arises. The angled pieces of plywood on the top sides could easily be removed and replaced with hardware cloth for ventilation. I didn't realize how small the chicken door is, I hope that isn't a problem. I get my chicks the first week in May, so they will be small for a while. Roost bars will be added, I didn't think about them roosting in the nest boxes, is this a major problem?