I am in the process of designing my coop for the 3 or 4 pearl-white leghorns I'm going to be getting. Due to many factors I'm down to having it on concrete, though it will be movable if necessary. The designs have a totally enclosed coop and an attached "run". Not including the fixtures (roosts, nest boxes, feeders/waterers) the square footage of both sections is the same...16 square feet for each section. At the most I want 4 hens in there so that's 4 square feet for each one in both the coop and the "outside" area. That all falls within acceptable limits according to the literature. My question is... am I going to be placing undue stress on the hens if they can't actually have access to the ground, and are instead basically living in an elevated cage? I want the coop stationary, but I don't want a messy, permanent chickenyard. I considered a tractor for them, but I want something better/more durable for winter months and the ability to ventilate it in the summer. Thanks for your time.