I leave the door to the little coop open for them but they rarely go in there. Each roof joist has a ceiling rafter at 6ft high, the chickens root on those. That was no by design, they just do it. The sides of the coop are all under ground level, about 18 inches on the up hill side and about 4 inches on the downhill side plus there is old sheet metal from an above ground pond buried down about another foot or so to keep stuff from digging under The entrance is a storm door. I actually upgraded it from the one in the picture but it closes very securely to keep predators out. You can buy a kit that is designed for building a shed for the metal braces for the rafters or just make your own. The kit makes it easier. I got them from Fingerhut. The coop was originally a green house, 12 feet longer and 3 1/2 feet taller with a koi breeding facility in it. I cut it down and enclosed it that is why, if you look close you can see that the whole thing leans to the left a bit. Make sure you use the heavier 1 inch square metal cloth instead of regular chicken wire if you have predators. That is all I can think of, the idea is just to make it strong and safe and give the birds a few options. Mine use the low perched=s during the day and the rafters at night, they rarely go in the coop except to lay. I also used the coop as a brood box by adding a red heat light. I never put food or water in the coop unless it is being used as a brood box. Hope that helps.