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We did the shower as well, it was OK but we also travel with dogs so there was always an issue keeping them out of it
In our 2022 Grand Design 2500RL, there is a wall down beside the bed between the bedroom and the front storage area so I installed a Cat door there. In the storage compartment on the passenger side, I installed a wall just on the inside of the cat door to keep them from roaming the whole storage area. I also installed a hinged door on the false wall so when we travel, I can lower it down, rest it on the cat litter box and then use that space for storage of blocks and such.
Keeps cleaning of the litter box to the outside, the cats can come and go, dogs can’t get in… it’s a win win