Just finished this for the most part today. Built it to house my smaller bantams like my oegb when they get old enough and my rosecombs and barred rock bantams. Each pen is 4'6" square roughly and 6' at its lowest point inside. Not sure if I'll build a run for them or not yet or just let them out on different days. The connected building houses my large birds now but is going to be split in half to divide my BLR wyandottes and Ameraucanas when they hatch and are old enough. Gonna build something similar on the other side only bigger and only 2 pens.