"I read reviews on other sites that talked about leaks, so after I assembled it, I used silicone caulk around all the seams between the floor and walls, and halfway up the vertical corner seams. I bought the largest, deepest litter box I could find to go inside; the space is about 18.5x16, and I found a box that is 18.5x15.5. All this was completely pointless, though, because as soon as my (large, neutered male) cat went against the wall, the urine ran to the front edge of the cabinet, under the litter pan, and dripped out under the door. Can't caulk that seam. I guess I could set the whole thing on a giant tray of some kind, but the point of the thing is that it doesn't look like a litter box, and sitting in a tray of cat urine would mess up the effect, as well as being gross and smelly. I have no idea what I'm going to do with it -- having caulked it, I can't take it apart to send it back."