I made some of these, about 45 years ago, and mine is still going. It has been transported all over for shoots, gopher shooting, reloading in remote locations, and so on.
Some pipe couplers, sawn at an angle, that I welded to plates. Countersunk holes for screws and lenghts of pipe as legs. They are quite solid, much superior to any of the factory ones that I have tried. The seat has a shelf with coss barrier to hold fired cases while gopher shooting. Sometimes 1,000 .223, & 22-25o 4o degree Ackey. They haven't even needed a new coat of painy, alothough....
ly in a day.