I never thought about a crate, but I don't think that would work. The litter box is huge and so is the one cat. There would be no room in there for both cats, litter box, food and water.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD