Build A Rear Seat Storage Cargo Or Bed Platform For Your Truck Camper

Cool, I'm interested in seeing your completed platform and cat litterbox area!  We travel with a small dog (Westie) and our cat.  I put the litterbox on the floor behind the passenger seat so the cat has access, but the dog can't get to it as he is secured to the seat headrest with short leash type connector and a body harness.