I am wondering about height of a run for standard size hens. I am thinking about building a run either 3 or 4 feet tall that would be about 200 sq feet for room for plenty of hens. I figure i can put a small access door to get to food and water. Does anyone have any suggestions for whether a man height run is better or short is ok? What other things should go in a run, do they need perches? Does anyone have any definite do's and do nots on run height? I would put a top on it of course for protection things.