I saw a metal shed at Lowes for $299 (8x10). It has a large opening at the front with (I think) two doors. We would put this inside of a chain-link kennel (probably 10x20 or 20x20). Can we just build some nest boxes on stands and put them in there and leave one or both of the doors open for ventilation? Do I really need an actual 'coop' that has the little ramp, etc? It doesn't get too cold here in the winter (avg. of 40+ deg. Dec.-Feb.) - I'm in Knoxville, so I don't think they would get too cold (plus I'll be doing the deep litter method which would give off a bit of heat). eta: my DH is worried that the shed would be way too hot in the summer. It's a light colored thin metal... will it get too hot for them?