Hi, mark, I read you post and the reply's. I agree with the comments of Chief shotguns and Kensal. The best is been achieved. Why not try te bring to revival the O/U from Edwinson Green. Or the sextuple grip from Purdey,who was to heavy as a game gun, but for a skilled gunmaker like you it is possible to make a clay gun from it.
I am sure there is market for it in the U.S.
You can also try to make a low profile A. CORDY once one of our best Belgian gunmakers.