I don't have a cat but this may make me reconsider. Sunni has one with a hinge on the cat door for easy emptying
INSPIRATION :: Cat Litter Cabinet :: How cool is this custom built cabinet?! Has a built in cat door (by Pet Safe) w/ a magnetized flap along w/ a vent in the back for fresh air. Painted gray w/ black knobs hinges.
Pinterest Success!!! It definitely works. I added a few srops of essential oil (my choice was cranberry) and hot water from the tap too and used it in my steam cleaner! How to get rid of cat urine smell from apartment - Bing Images