I'm thinking of building a coop on skids (moveable)with hardware cloth on the bottom so the poop falls through. My question is here in the Atlanta area the winter temps can get into the teens, but mostly in the 20-30's. Is it okay to have the coop bottom open in that kind of weather? I was thinking of making it so I could slide a some 4x8 plywood under the bottom to block the winter wind. Would RIR's be okay through an Atlanta winter?