Gorgeous!!! Did you know there are two species of ptarmigan there?
I have boxlock, sidelock, and false sidelock SxS guns and feel the level you are looking at eliminates that consideration except for aesthetic concerns. False sidelocks increase the canvas size and "look" richer. But a Philadelphia Fox boxlock need not be homely...
Bending stocks is more than possible, so most stocks can be made to work for you. Knowing exactly what works for you should enable a good hand to match it.
Find your aesthetic choice and get someone to make it work for you...
