I am starting a hoop coop tractor today. It is going to be used for our 50 meat chicks that arrived yesterday morning . They are already stinking the house up, so I want this done soon and get them outta my basement! Anyway, I was looking at these plans- http://www.plamondon.com/hoop-coop.html . I know that the idea of a tractor is so the chickens can eat grass and bugs, but I am worried about it not having any type of floor or other protection against predators digging under. Any suggestions? Is this even a potential problem? Thanks!