Hi PG, well I made one. I did change up a couple of things. First I used a 3/4 ply for the back. Next I cheated and used plumbers putty on the first lift. about one inch thick, It was a little cheaper then the duct seal. Second lift was the duct seal 12 one pound bars. Ya I made it a little bigger. She's a little heavy, but you wont knock it over easy either. It's working great so far. Plus I don't have my neighbors looking for pellet dents in their cars. I have one that must think that I'm using his car for a back stop. Every other shot into the metal trap he would walk over to his car and look it over. I've assured him over and over that I'm not hitting his car. Now? he doesn't hear that PING, so all it well. He just looks at me like I'm a eight year old trapped in a fifty year old's body! Ha, He's right! Jim