Build a cat litterbox that can be placed anywhere in your home.
Once you have the concept down, you'll need to go shopping for materials. We found the kind of storage cabinet we wanted for this project, took measurements at the store, then went hunting for a plastic container to serve as a litter tray. An inverted wire storage drawer served as an entrance/exit deck. We also needed four 1" L-brackets.
Step 1: Measure and cut ingress / egress
You'll need to figure out where you want to put your exit door. I chose the panel facing away from a clear line of sight. Once cut, I tacked in .25" weatherstripping tape.