First off, welcome to the Forum. You already know the importance of very sharp tools, and accurate measuring. The kits you speak of aren't kits at all but parts sets without instructions, but that is good. It allows you to customize your order and get exactly what you want. Pecatonica makes the precarves for Track, so I would choose them. Chambers unfortunatly doesn't make a Southern Mtn rifle, so that leaves them out, even though they're the best. By going with Pecatonica you can make changes when you order. For one thing all these parts sets come with a Germanic lock standard, when a correct style should be a late English import lock like the Siler late Ketland. Dick at Pecatonica can do that for you. He can mix, and match different different parts also, like a swamped barrel, all of which you choose before he cuts your stock. A Southern Mtn rifle is an excellant first gun to start with.
You do know that you're going down a slippery slope, that there is no return from. Welcome to the misery.
Bill
There is no better pain killer than ice, and it works especially well when it has whiskey poured over it--Gracie Allen