Wow, this subject seems to have taken a miserable turn!
Some of us seem to feel that in order to become a "rifle builder", we have to grow our own maple tree, harvest it, then commence with a branch or part of a trunk.
Then there is the metal: Go find you an iron ore mine, refine it into steel. Cast your own lock. Go visit a copper mine to get material for the brass.
Meanwhile, the other guy buys a CNC-machined kit, and does his own thing with it. And he/she can get as elaborate or not as the personality dictates.
For most of us, I'd say about 90%+, the object is to have a flint lock rifle that can be taken to the range, or hunting, or just be hung on a wall to admire.
For the other 10%-, they are trying to make a living in a difficult field of endeavor. My hat is off to ANYONE who elects to fill their gun cabinet with longrifles. And if Mr. Kibler or Mr Chambers, etc., want to help them, then kudos to the kit supplier.