For two cats, i would do this spuble long and keep it umder a window sill, drill some holes in the back so it can air out, keep both sides totally separate so the cats can have their own space but also keep everything together for cleaning purposes.
A DIY Cat Litter Box Holder is a simple homemade way to hide a kitty litter box. Give your cat's space a fresh makeover! Home hidden litter container. DIY Home Idea for Pets. I used Tidy Cats LightWeight with Glade Tough Odor Solutions Clean Blossoms.