You could build one easy if you got the tools. Got tools? Or you could do what the rescuers do, make them a "house" out of a large storage container. I made one when Mike and I were trapping those at Wal Mart and it is easy to do. You could slip some of that skirting up and put it under your house. Use old blankets to put around the outside , duct tape to keep it (blankets)on, put it inside a large garbage bag to keep it dry... Be a lot cheaper than building something.