I like the Ms2 alot, but im not found of the lock jaw do dad. However between the Ms2, and my Gear Sector, I use both of them just as much for my working systems. The Vickers you modified looks like the best of both worlds of my two. I'm not sure what kind of attachment device would be best, but I'm thinking a plain jane HK hook would be good.

Keep it up, I'm sure your going to find the answer before your done