I’ve tried this before, and honestly, the biggest issue for me was food mess and the cardboard getting soggy or greasy over time. If your cats are tidy eaters it might work for a while, but in my experience, even small spills can attract bugs or make the box smell funky pretty fast. Also, some cats like to eat out in the open so they can keep an eye on things, so just be aware they might not use it for eating long-term. I’d suggest lining the floor inside with something waterproof if you want to give it a shot-easy to swap out if it gets gross.