Dad and I got spring chicks that have grown up to be mostly roos. Aggresive and scary roos. They mount everything, the few hens, the younger chicks, the guineas, even the ducks! When we got them originally, dad had brought home a "shed" of sorts. It had been a clothing drop box for a charity which had been prdered on numerous occasions to remove, but didn't. It measures about 4' x 4' x 6'. I managed to install a roost, and now a nest box. BOY IS IT CRAMPED IN THERE! Anyway, we have a 3' x 4" x 4' converted doghouse, and a 2.5' x 3' x 3' chick pen that has an attached 4' x 5' x 5' chicken wire run. This last one is too small for any of the birds now, however the young ones do hide in it on occasion. It is all surrounded by a large electrified poultry net fence. I need and want to separate the hens and roosters and everyone else. Dad wants everyone free-range. We have limited supplies, but sufficient. I need a SUPER-SIMPLE hen house with an enclosed run big enough for 3-5 hens now with 7 younger birds some of which may also be hens in a month or 2. Maybe about 5' x 8' x 6' or so.