First off I live in Charlotte, NC, so pretty warm (winters sometimes get below 30, but not often). I want to build a movable coop for egg layers that has no bottom at all, it will just have nest boxes and roosts. For the few nights it does get cold I might design it so I could slide in a floor for just the night, but 99% of the time I want it bottomless. I know tractors often don't have bottoms, but most still have an inside part, with a floor. Is this okay? Anyone done this and have photos?