Does anyone have some good links to pre-made coops? Or actual plans for coops? I have been peeking around on the coop plans page but very few list materials etc; I have a good size (17 x 8) building that I've used, but it's not movable, it's not super well ventilated (one window) so it can get damp inside. I'd like something I could pull with my quad or lawn tractor. Let me know! Thanks!