I used this plan but raised it off the ground 18" and made it half as tall: http://ana-white.com/2012/05/plans/shed-chicken-coop. The inside is still just empty with a temporary roost since they are too young to use nest boxes or a permanently high roost- they are sleeping in a pile on the floor even though they will sit on the temporary roost during the day! Here's the inside: I insulated the ceiling and the sides but not the back since it's flat up against the house. There are two 8" square vents up high in the back, and the front eaves are all open with hardware cloth screen for ventilation. They already prefer going in there in the afternoon when it gets hot outside- it's definitely cooler inside than out!