New to chicken coops. My design is to use 2 cabinets I've found, back to back with ramps leading into the partially open backs, separated by a 15' covered run. Question is: how do I prepare the cabinets? They were found pretty rough and I'm wondering if I need to seal the inside, like, do I do layers of varethane inside and use caulking in the corner seams? Is that overboard? Thought it might make cleaning easier and be more sterile of an environment for the girls. Also I was thinking of leaving the exterior unfinished. These cabinets were found outdoors. I figure if they're covered with a roof it shouldn't be a problem. Thoughts? So excited to find you all!