Does the height of the coop make a difference for heavy breeds? My current plan for a coop is a 4'x6' with the 1st level a 2' high enclosed run and the second story only 2-3 feet tall (so the whole coop will be 5 feet tall) and movable. I would like to have space for 5 heavy hens. I do plan to let them free range a bit around my tiny backyard each day while I'm out with them. Inside: 24 square feet, but since its short, the roost will take up space that would be counted as floor space in a taller coop. Rainy/snowy day protected run: 24 square feet (but the ramp and waterer will take up some space). Should I plan to build a little taller enclosed part? I want to be able to move the whole thing around on in my yard - tractor-style.