I'm not the original poster, but thank you for the wonderful pictures. I'm in the midst of my own buildin project - using The Garden Coop plans - and am paused at roofing materials. My local hardware store sells the SunTuf Polycarbonate roof panels for around $35/sheet, and I need 6, plus the spacers ($8/packet). I'm open to a metal roof that will be less expensive, but I'm a novice builder. Can you talk to me a bit about the material used on top of your rafter grid? Is it a foam material? Did your sheets come in 8' lengths? Any cons to using metal vs SunTuf that you know of?