OH MY GOSH when I get a cat I HAVE to do this! It would be SO funny for a guest to go to use the bathroom, but the cat is using it! But like its still so awesome that the cat just uses the toilet. I wonder if you could train it to flush, too.
Not sure about mounting up high but a cute idea. "A diy cat project so easy even the laziest of pinners can do it TONIGHT in less than 10 minutes! Wicker basket + folded up blanket = BOOM! Instant private kitty oasis perfect for escaping annoying humans"