I have an earlier version of a TVM Fowler made when Jack Garner owned the company. Mine is a fine gun and rifles built by Matt Avance are nice rifles.
As the site states, these are made in the spirit of an early Lancaster rifle. You can do a few semi custom options to make the rifle more early in appearance. First, get the 42 inch swamped barrel. The advantages you get in handling more than overcome the added cost. Second, get brass furniture. Brass was the common material for trigger guards, butt plates et al. Third, get a round faced lock. Early rifles had the round faced lock. Fourth, specify your length of pull if you know it. Otherwise it will be 14 inches.
While you are waiting for the gun to be built and delivered, find a mentor who will help you learn the artistry (tuning, flint selection, and black powder supplies) of shooting a flint lock rifle. Get a range rod with appropriate cleaning jag.
While you can, order "Black Powder Accuracy " from Dutch Schultz. Lots of threads on this forum about Dutch's system so you can find a link to how to order the system.
Read up on the instructions available on this site and prepare for a wonderful experience.