Maj Dad,
The Possible Shop (TPS), carries a number of different kits, from various good quality, and modestly priced, manufacturers. Names like Traditions, Lyman, et-cetera. Most kits are offered in either flint or percussion, and most kits offer more than one barrel style, i.e; caliber, smooth, et-cetera. The only drawback there, is, most of the kits are post revolutionary era, a little more updated than what I think your looking for, but they do have a couple, and, the price is right. They stock, pistols, carbines, rifles, and muskets, both finished and in kits.
http://possibleshop.com/rifle-kit.html
http://possibleshop.com/pistol-kit.html
A source, that is much closer to what you are looking for, mostly revolutionary, and BEFORE, era reproductions, that stock VERY ACCURATE, AUTHENTIC reproductions, in muskets and pistols, with a few rifles, but mostly smooth bores, and nearly all flinters, is an outfit called Middlesex Village Trading Company. Now, alot of people here will tell you to stay away from them, that their guns are made in sweat shops in India, and that they seriously do not trust the quality of the barrel steels used... Well, allow me to assure you, their guns are not purchased from stock, they specify the design to the makers, the guns are made, just for them, to quality standards. The proprietor of the shop, goes through, each and every single gun recieved, tuning them, testing them, adjusting them, when delivered, not only are they SAFE, but they function PERFECTLY, the geometry, the timing, the tempering, is PERFECT. Besides, all being hand made, in my oppinion, makes them VERY AUTHENTIC, they are actually made, in the same ways, as the originals were, and because of this, there are minor variations from gun to gun, just like the originals. As far as I am concerned, they are as close to the real thing as you can get without buying a rare and expensive antique. Their pistols range in price from about $325 to a high end of about $425, their muskets range in price from about $525 to about $750. But these are fully assembled, fucntioning, ready to go guns, they don't offer kits. Many are military models, with optional bayonette and scabbards available.
http://www.middlesexvillagetrading.com/index.shtml
There are some famous people out there, and they do make excellant products, but I am not an expert in those guys, some of the other people here can better guide you in the custom gun makers and custom gun smiths functioning here in America today. Not all are exceedingly expensive in price, some, actually are competitive with mass manufactured gun prices, surprisingly enough.
Sincerely,
ElvinWarrior... aka... David, "EW"