Nice machining, make sure you keep those photos coming. This should be a very interesting build, a double rifle from scratch is the most interesting of all, especially a rising bite. Sounds like you have got some great ideas, bar in wood with a rising bite and Bertuzzi type locks and sideplates, doesn't get much better than that. Looks like the knuckle was machined with a milling machine, are you going to use a knuckle scraper to finish the profile ?

Waidmannsheil.