Looks great Gene!
Quick question, what keeps the rest at different elevations? Got a setscrew or something holding it down/up? When I bought my shooting bench a few months ago the first thing I took off was the rest, it was such a poor design it wasn't even usable. I'm now using the bench with sandbags, and you can adjust the aft bag for elevation...but not very much. I need to come up with something better. Funny because I have this beautiful bench in the garage, but I use a camera tripod with a chunk of wood on top to shoot from, partly because I don't want to pull out the bench, and also because of the poor ergonomics it provides.
You solution is about the best I have seen so far, maybe I should sell my bench and come up with something like yours.