I am either getting 15 or 25 medium-large breed chicks this Spring, so I will have a total of either 22 or 32. I need to build them a bigger coop to lay their eggs in and roost in at night. They will free range on 4 acres during the day. Right now I have a 100 sq/ft shed and a 200 sq/ft unfinished horse shelter. The shed only needs a door and a window cut, nest boxes added, and perches. The horse shelter needs 2 walls added, nest boxes, and perched. Are either one of these big enough for all of the chickens, and if so, which one should I use? The horse shelter would give them more space, but it would cost a lot more to finish. The shed would be pretty much cost-free, but it might not be big enough. Thanks for the suggestions!