has anyone tried using a green roof for their chicken coop? We are building a new coop. It's round and the walls are cordwood and cob infill. We would love to do a green roof on it both for looks and for heat control in the summer but it would also be neat if we could plant something the birds could eat on it. We don't want to have to build a fancy support system for it though, it's only 6 feet in diameter. Any ideas or suggestions?