I'd like to raise 2 or 3 egg chickens and around 10 Cornish X for meat... so 12-13 chickens. I need to build a coop and want to make sure I make it large enough to accommodate all of them. Since the Cornish X chickens won't be in there for more than a few weeks, does the 4 sq ft per chicken rule still apply? And, just to make sure I'm figuring this correctly, the 4 sq ft is the total floor space, correct? So if I have a 4'x4' floor, that would only give me 16 sq ft of space for the chickens = 4 chickens? To house 12 chickens it sounds like I'd need a coop around 6'x8' but that seems really large to me. Is that correct? Do I need to make it that big if I'm raising the meat chickens that won't be in there long? Also, while discussing Cornish X, at what point do you move them into a coop from the brooder box? Thanks!