I recently built a 4x8 coop for my soon to be chickens, it also has a 2x7 external laying box (4 dividers inside it). The coop is 7feet tall on the inside and has about 30 linear feet of roosting posts. The coop is up off the ground 2 feet and encompassed by a 24' x 24' run. If my math is correct that's about 46sq ft inside( counting the laying boxes) and 576' outside. I was hoping to raise 15 chickens. Is this suitable?