There are so many different levels of "precarved" stocks. The fowler I built last summer took no time to inlet the barrel. The stock I bought, and stalled on, for my 16ga fowler was shaped the same outside. The barrel channel though was only a 1/2" groove.
For finishing, I grabbed some of these from work last summer. I chucked them in the drill press and put it on the highest speed possible. Took very little polishing on the buffer to make it a mirror finish. The buffer alone works on brass, but this was great on the steel parts I used on the 20ga.
Without reading the entire post, yet!, I venture to post. Kit Guns can be made incredibly beautiful fairly easy, with stuff you prolly already have out in the garage! They can also be custom tuned to always go bang, and shoot how you would wish them to shoot. Since the handle of the Thread originator is PsychoBeagle one needs assume he hunts rabbits. A smooth bore will do it ALL. from rabbits to deer and bear. 57 cal is 20 gauge. If you like a little 'sport' it your gam-ing IMHO..it's the ticket gunne. I'm working on a flint pistol kit gunne for friend lost it in the flood here. He doesn't know I have it, and he will not recognize it when he gets it back And it WILL shoot I'll watch this thread pretty close now..I like it. A lot.
I have and use older TC small framed caplock rifles in .32-.36.45 for small game, if you can find a good used one I think they are the prefect size for deep woods hunting, light-short and accurett I lean to longer flint locks tho.