We have stray cats using our grandchild's sand box for a litter box. The sand box is 8ftX6ft, made with treated 2X10. We are thinking of making a vinyl lattice cover with hinges, hoping to make it like a panel screen where it folds over itself until it folds off the sandbox, and maybe have it hooked to the box on one side. I can't find any web sites for that kind of design. Do you have any suggestions that will help me? Web site, personal experience, or other suggestions.