My wife and I get a 25 hen delivery each spring and up until this spring we have been using our neighbors' coop to rear the chicks until they are just ready to lay, at which point we harvest the previous spring's group for the freezer. Our neighbors are expanding their operations and will be needing the space from this point forward. So, I have a plan to build a coop on wheels (probably on an old trailer frame) that is just large enough to house the birds for about 18 weeks or so. I was thinking of making it about 50 sf, with ample roost space. I know that 2 sf interior space per bird is less than the suggested amount, but the weather will be such that most time will be spent in a 200 sf run. Will the girls be OK under these conditions for that length of time? The final coop size is yet to be determined, and will depend upon the frame that it's built upon.