I'm going to build a raised coop and will be limited to how tall the coop can be cause it will be inside a dog kennel. The top will be at 6ft as there is chain link over the kennel. How much head room is needed for large chickens. I've seen pics of chicks inside coops roosting wing to wing, and as high up in the rafters as they can get. Also should they be any certain height off the floor. Thanks