Thank you for caring for the cats.

I can make one suggestion. Try buying a couple of large Rubbermaid bins with lids. Flip them over onto their lids and cut a hole large enough for the cats to get in and out. Line them with newspaper, and straw or old blankets. They make great little kitty "houses" and the cats will love them!

Please keep us posted okay? And good luck. What you're doing is wonderful!