Hmm, great idea. I don't think we have space for this, although it might go in the cabinet under the bed (2006 View J). Having the litter box in the shower is not only inconvenient, but in Her Majesty's enthusiasm to cover the deed, she always manages to toss some grains into the shower. I'm fairly handy, but suspect this may be beyond me, alas.
As for the odeurs which may or may not issue from the throne room, I've been amazed that almost everything seems to rise up and out the vent, even when the fan's not on. And our family includes a nose that knows, if you get my drift.
This is a formerly feral, one-eyed alley cat who decided a decade ago that we needed civilizing and moved in. Great cat; lots of character.
Dan de La Mesa
CA