I am about to start building my second coop and will be doing a tractor. I am trying to decide whether I want to make a "penthouse" coop above the run with a ramp, or just leave it all one level and not have a floor. The birds will sleep on the roost at night, I would have laying boxes with wood shavings in them and in the winter I can bring in a thick pile of hay for the floor of the coop. If I do the single level, I will probably make it about 4'X12' and 4'x4' will be walled in as the coop and 8'x4' will be the run. Not having to muck out the coop sounds like a delightful thing. I live in No. Utah, so we have cold winters. I don't have any kind of predator problem in the neighborhood. Any thoughts would be really appreciated.