I understand your excitement at the prospect of building this rifle, including your desire to use as many techniques used by the classic gunsmith's of the 18th century. However, I have to agree with Dave. Keep this build simple. As simple as anyone could make it. I would encourage you to avoid attempting any carving, engraving, or using any home made finish, on this one. Save those experiments for scrap wood, before cutting into good, expensive wood.
If you want to learn to carve, or experiment with home made finishes, pick up a package of grilling slabs, containing slabs of maple and other woods, as a place to begin. There are quite a lot of instructional videos on wood carving, on line, to include what tools you need, how to use them...and how to keep them sharp. As far as Longrifle carving videos, Wallace Gusler, Mike Miller, and a couple of others, have excellent videos, available through American Pioneer Videos, and vendors such as the Log Cabin Shop. There are also a number of longrifle building classes, and associated arts, available throughout the year.
I also second the recommendation to follow Kibler's instructional videos, to the letter, for this rifle. By following Jim's instructions, you will complete a very nice rifle you can be proud of, and one to enjoy for years to come.
IMHO, using this rifle to get your feet wet may spark the passion for building fine longrifles, but that takes time, lots of work, and a good bit of education from expert builders, to turn raw parts into fine rifles.