I built this out of scrap rough sawed lumber, oak and yellow pine. I have a pallet jack and built it so I could move the target stand around inside my shed. I mounted a roll of building paper at the top and pull down a fresh background to draw on when it gets full of holes. Only thing I had to buy was a 5'X5' piece of 1/4" steel plate as the scrap metal yards didn't have anything big enough that wasn't bent. The local steel fabrication shops had some small drop pieces but by the time I bought welding rods it would cost more than a new piece. The oak stops most fired rounds before it hits metal but after a while the wood starts getting pretty chewed up and needs replacing. I have replaced the center section twice. I am a contractor and wished I had kept the LVL (wood support beams built up with plys of wood under glue and pressure) scraps that I hauled to the dump. They would make great bullet catchers. If our economy ever lets me build again, I'll replace the boards with them.
My shed is 50'X55' and I can adequately get 45' from the target with the big door closed. Most of the time I practice at 20' to 30'. I'm not very good shooting while on the move so I practice that at 15+- feet. The shed is about 99 feet from my house so I don't have to go far to shoot. I'm a little afraid to shoot a high power rifle at this rinky setup. Probably to short anyway. We have to go outside for that.
The lower pictures are of two that got away. It is deep woods, we are shooting down into rising terain and a long way before another house. The two Huck-Oh holes in the back are from, will you know. One by me trying to shoot on the move from 40 ft and the other by my son. Made the mistake of having his finger inside of the trigger guard and wasn't ready to shoot.