Although I just finished my coop, I'm think of an addition on one end for a larger roost area. On the end I'm thinking of the putting the addition all I have there for an window about halfway up the wall. My question is if I built add that addition and extended the 12 inch window to the floor, that would make the door 12 inches X 35 inches. Would the hens know that was another door to a larger roost? Would they investigate or would I just be wasting my time and money. That would make the coop 5' X 12' with a roost area of 4'X5'. Would it work? Will they go in on their own?