Planning for a new outside enclosure for our 5 yo Sulcata and have some ideas I would like to run by y'all. First, I'm in southern AZ, so temps are really good for them. Second, the new area will be approximately 1000 sq' with one large Palo Verde tree for shade. I have some left over materials from construction projects that I would like to use. First, to prevent digging out, I thought about burying galvanized roofing metal 12" around the perimeter. Second, I have some pool fencing that I would like for the perimeter. It has 4" spacing between vertical rungs and would use some hardware screen to prevent even getting a head through. Some people say not to use fencing that they can see out of, but if fortified enough, is it OK? On the enclosure, I plan on making it big enough for a grown tortoise, but something I can grow with it by moving walls and enlarging the opening. What is a good "door" that they can get in/out of while blocking some of the wind. Would it be a good idea to make inside walls to help keep heat in during our cold days? I plan on fully insulating floor, walls and roof and using a pig blanket when needed. Any ideas or something I might be overlooking? Unfortunately grass is really hard to grow, so I won't be doing that, but plenty of hay, cactus, and others are fed.