The cat litter box in the hall being the first thing you see when you enter our apartment always bugged us, so we decided to do something about it. We bought a cabinet at a flee market for 20 SEK (about $3 USD). Took it home, made sure the litter box fitted inside it and measured out a hole in the side. Then we used one of these guys to prepare a small hole to fit the jigsaw, sawed up the big hole and used an rasp and sandpaper to finish it up.
The cats seems to think it’s ok.