Large plastic storage box or enclosed cat litter tray (Skirwith CA10)

Hi I’m looking for an enclosed cat litter tray (or 2) (pic for the kind of idea) or 1 or 2 large plastic storage boxes I could make into such a thing (condition doesn’t matter as long as they’re not cracked on the bottom). Weve moved to a tiny space and I’ve been using cardboard boxes for the litter tray containment but the cats keep weeing on the card!
Many thanks in advance!