Ken, welcome!
I've built both race cars and airplanes, but none from a kit. VariEze (Hah!!), Bakeng Duce, Taylor Titch, a few others. But now that I am all retired, I play with long rifles, and do indeed love the ingenuity of the flintlock mechanism.
For answers to your 5 questions: Yes. Yes. Yes. In the white, rust blued/browned, fire blued. Yes.
See, isn't that easy? I do believe that to build long rifles, one needs a good sense of humor, tons of patience, and the ability to fix mistakes. And that is what you have all of us for. None, or very few, of us have all the answers, but between us we have many if not most of the answers.
Again, welcome!