I saw one professionally made on the net and later saw that someone had made their own version. I said to myself "Self, I can do that!" A scope ring, some aluminum bar stock and a drill is all it took. Can't wait to give it a try.
A version of this was being sold by practically EVERYONE at the DU/Mid-South Hunting, Fishing and Outdoors Show in Memphis last year. Starting price was about $75 for a mount with no rings all the way up to $600 that got you a cheap 4MP cam, mount and a set of rings that clamped to the SG barrel. I passed as I figured it was way cheaper to bring along my hunting pards son and stick a camera in his hands as opposed to a shotgun. Only drawback to bringing his son was that boy can put down some groceries.
BTW, nice work. It had to be cheaper than the asking price at retail and probably better workmanship.