DD,
"this gun" or "these guns"?--I now simply think of it as a silly project. The only multi-barreled gun I want to work with in the future will have the barrels securely soldered together with ribs top and bottom. I still have the checkering to do on three forearms and the pistol grip, 2-3 rust bluing passes on the barrels and most of the case and chest lining to do. The lining is Hainsworth calvary yellow wool and complements the dark stuff nicely. This shows the lining of the reloading tools and ammo blocks that are inset into a 1 1/8" piece of yellow cedar that has been routed out.

The top part of the chest will house the action/butt stock, a Fecker and a Unertl scope, a cleaning rod and the BSA 8 peep sight. That part of the chest is not yet divided and lined.

Here is what the EDM cuts on the thread shank looks like and the precision of this process gives very good consistency from barrel to barrel.

This project is about mile 17 of a marathon and I can't imagine being a professional and having to do this for a client.