Is this coop and run an okay size for 3-4 hens. I currently have 2 but i am considering getting 1 or 2 more. The coop is 3'x4' and the run is 5'x4'. According to this website, for three hens, 3'x4' would be fine, but the run would have to be larger. Would the 20 square foot run be okay for 3 hens? Here is the coop so far, it not quite finished, because i still need nest boxes.