I have rainproof areas made from pallets, tarpaulins, galv., twinwall polycarbonate, old puppy panels, old fireguards and external ply, held together and in place with baler twine, rocks, bricks and the side of something bigger. Yes, I think I must have been a Master Builder in a shanty town in a former life. The chickens don't mind what it looks like and you can use them as an excuse to cancel the House & Garden photo shoot. Get creative!