How thick should the walls of a henhouse be? Is 1" necessary? (I live in TN and our winters are pretty mild. Heat/humidity will be our main issue.) Do you prefer plywood or or some other composite material? I am planning a sloped roof that is hinged so it can be opened. What material should that be? I will probably shingle it or use something like that, although I don't want it too heavy to open. Thanks!