I just took a look at your design. Looks nice except, I would have the roosts go longways. Just imagine yourself being a chicken on the way to the nest...(like every day!). Will the chicken have to duck to pass under the roosts? And remember, there will be lots of poop under the roosts, so your chickens will have to walk over the poop, get it on their feet and hop into the nest with dirty feet. If there are other eggs in there, they will probably get dirtier than you would like. I would probably put the ramp on the front and the roosts along the whole back side. That would leave open most of the coop for walking around in. I think you had door under the coop....just make sure they are made big enough so you can get into them....to clean and to go after a chicken if you need to. Are there other vents in the top at the back, too? I will look again.