We're building a coop for a small breeding flock of Silkies (plan was for 5 birds) and I think I screwed up with my math. (In a good way.) My dad and I have already built out the frame and today he turned to me and said: "I think it's much bigger than it needs to be." It is very large. It's 6 X 8 and the height is about 4 feet tall. We went with the numbers 3 sq ft per bird, because although they're bantams, they're large. -Winters are cold here in NY. They'll have a large run all year long, but probably won't want out in the winter much. How many birds can I fit nicely without getting into trouble with feather-picking? I just need a number.