I'm looking into possibly converting an old milk house into a coop. The area adjacent to it has a pretty large concrete slab where an old building use to be. Does anybody know of any problems there would be to build the run over it? I won't be able to drive any posts through it, so it would have to be built right on top. I'm not sure what I would make it out of or even how I could anchor it down. I thought about trying to put it in a different location, but the milk house is a brick building that only has one door and how it is located doesn't give me many options. Any suggestions?