With Ryobi ToolBlox cabinets and tool boxes as large as they are, it’s not going to be easy moving them around a garage or workspace, at least not without the roller base. Description from toolguyd.com. I searched for this on bing.com/images
Stackable wooden box. This would make a great base to put a litter box in! Put a divider in the midle, and a shelf on top, so things can be stored in one side and keep food bowls on top. Then put in a climbing post and nesting areas for the cat on top of it all.