DiY Cat Tree and catwalk ~ How cool is this! Love the leopard-skin carpet. The tree is constructed of a 4X4 fencepost, and 3/4 inch CD plywood for the base and landings, the rail for the top is 1X2 white pine. Everything is "screwed and glued" and there are NO staples used on the carpet. The carpet was stretched while the adhesive dried for a more better fitting.