I had a fitting 10+ years ago, it cost me about $250 then but was well worth it. I got dimensions for both SxS and O/U, they are slightly different. Once you get your numbers from a fitting you can start looking for a gun, you may get lucky and find a gun you like that's very close to what you and the fitter determine is best for you. Find an old beater butt stock for your 311, buy some Bondo and modify the stock to fit you, see if you shoot better over time. You can also adjust for point of balance.
In my limited experience stock bending can take a gun that's in the ballpark of your measurements (determined by having a gunfitting session) and make it closer. Sometimes the wood bends back, sometimes it doesn't. You can adjust length by removing wood or adding a pad.
You can drop $5000+ on a new gun and and still have to accept factory "standard" dimensions.
I think the best bang for your buck is to take your favorite gun in use now, perhaps one of your Elsies, and have it restocked to fit you. You'll never recoup the expense but it will be your "bespoke" gun and (assuming the stocker does his job) fit you. You'll get correct LOP, DAC, DAH, cas and balance can be adjusted.
And you get to pick wood you like....
