Those are awesomtastic nappy boxes for your kitties!! I think I may have to steal your idea for my poor neglected kitty kat. Since the kids came, he doesn't get the lovin' attention he used to. He used to sleep on my quilt frame when I had (the only quilt I will EVER hand quilt) on it. I am sure he misses it.
Your kit-kats look very well loved!!