I have six chicks right now, and will probably get 4 more at some later date. I know I want 3 sq ft per chicken, don't want the hens crowded. How tall do you guys recommend making the coop? My run will be a full 8 ft high, and the coop will be in the run. so that it'll all covered, and I want the coop to be raised up so they can go underneath it. Would the coop being four ft tall be reasonable?