I was going to build an "A-Frame" (and still may) but am also considering remodeling an old garage. My plan for this coop is 8'X12' with a 12'X12' dog run attached outside. I will also add two fout foot wide windows, one on the south and one on the west (no access to the east end). The nest boxes will be accessible from inside the garage without entering the coop area which also will have a walk in door in the garage. I definitely plan on having sand under the roosts, but would there be any concerns about having the entire coop floor covered with sand?