Al,
I did exactly what you’re talking about. Only difference was my New Englander donor was a .54 cal but in the same kind of shape and I had to pay $70 plus shipping for it. I sent it to Bobby Hoyt to be reamed to .62 and he did a great job, as he always does. He won’t go to 16ga because of the sight screw holes. I had never thought of that being a problem but having them close together it might be possible to rupture the barrel if the metal was cut too thin. Anyway, I slimmed the stock down, bobbed the fore end and put a nice piece of ebony on it, for the tip. Polished some of the metal and rust blued some. Came out kinda purty. Looks a bit like an English sporting gun. Doesn’t handle like one though, too short and heavy. A longer, lighter barrel would help that. But for < $250 I can’t complain.
I have used it in a couple of local mz shotgun shoots and have won them both. Working up loads has been an effort but still fun.
Best of luck!