Not only a shooting bench, but a 3 legged stable table is good for a lot of uses on rough ground. I don't know how I missed this thread for so long. As a life long welder/fabricator, at Lonny's price I wouldn't spend the time to make my own if the materials were free.
Also... I suspect the brackets would work very well for a 3 legged shooting stool Or maybe Lonny has a similar idea?