Hello, I raised chickens as a kid and I am now interested in doing the same with my kids. I have land and no neighbors for about 1 mile so they will be free to roam wherever they want. Problem is my wife does not want me to clutter up the yard with a coop so I am trying to integrate it into an existing structure, I have this space below my kids swing set and I thought of building a small coop in there. An enclosed stacked space above a run ( If I remember that is what you called it ) One problem is grass does not grow on the bottom and I presently have creek rock there. Is this a problem? The space ( on the inside measurement ) is 51x51x48 and is near the tree line so the chickens can roam in cover if necessary. Like I said I did this as a little kid so I forgot most things and am just get excited by the idea. Any help would be appreciated.