I'm building my first coop, and I'm unclear on exactly how much space my ckickens will need. The plan is for the run to be a 4' wide x 8' long x 6' high enclosure fenced with 1/2" hardware cloth, and for the house to be a 2' deep x 4' wide x 4' high plywood in which to house a roost and nesting boxes. I'm planning to get 6 chickens, and I've read that I need 4 s.f per chicken, or 24 s.f. in my case. Is this 4 s.f. per chicken requirement in reference to the run or the house? I want to make sure my plywood house is big enough for them.