This is a really cute design, but did not function well for our cats.  Litter box was too low and the cat urine ended up inside the box crate.  Eventually the whole crate had to be thrown out.  Had we sprayed the inside with a moisture barrier, it may have worked.  Our cats were used to a deep litter box, so the transition to this crate did not work well.

Pros: Good idea
Cons: Finding a litter box that you don't have to cut.