We're going to be building a second coop this spring for a second batch of chicks but i'm not sure how many i can comfortably fit in there? It will be an 8' x 8' coop with a 12' x 12' run attached. I have 10 in this size currently and they have more than enough room. So in the new coop of this same size how many do you think i could comfortably fit? We're thinking 15 would be good, but not sure. The new coop will be all hens, and at least RI Reds, Ameraucanas, and Barred Rocks for inhabitants.