I can't help but disagree with the discouraging of A-frames. I've constructed a 16 x 8 floor with 8 foot sides, and it's working out great. The only time the chickens get off the floor area is to roost, which is no problem. My nestboxes are only 2 feet off the ground. The cost of materials is definately cheaper, and the only trick was having a mitre saw to cut the 30 and 60 degree cuts on the ends of the side boards. No wasted materials at all.