Getting ready to start building some all wire cages. Will be hanging them from the walls in an old horse barn, open on the south side, so will not have a roof on the cages. Will be getting some Californians in a couple of weeks. So what size should I make the door? I have read many articles on cage sizes, but virtually no info. on door size and design. Also, should the door go clear to the floor, or will an inch or two across the bottom, not opening, cause a problem? ----- Another area I have trouble finding good information on is what to do for food and water. Especially, water has me concerned. Normal winter temperatures include several days with temperatures in the minus zone. (That is F.) We can go many days without even getting close to thawing temperatures. What kind of feeders and waterers seem to work the best?