The drum used in the CVA type guns mimics the conversion used to convert flint guns to caplocks. The snail type drum mimics the original manufactured breechplugs made for cap use. The questions still remain and we have some hard facts. The original guns of this type from before 1840 tended to weigh in about 12 pounds. None of the factory replica's is even close. The barrels were longer in the 36 to 40 inch range mostly. The sights were primitive fixed on almost all. The questions come in when you start to ask things like which cheekpiece is more authentic for the pre 1840 time frame. Which nose cap type is correct, or all three of the normally seen options correct? Did the early models use the slim line buttplate and stock or did they mimic the military guns of the time? Is a pinned simple trigger correct or is an inletted plate style more correct? Are the reports of the long trigger guards and trigger plates adopted to allow additional support in the wrist area with the plate adding support and the guard hiding it? That is the reported historic reason of a few years ago. If you use the nose cap without the integral entry pipe, is an inletted skirt proper or not on the entry pipe? Which type of fixed sight is the most proper?
There is a flintlock Santa Fe hawken on sale at the local gunshop. The overall quality of the piece did not impress me but the sights were maybe the best I have ever shouldered. It definately is no where near the weight and the build of the originals. The 52 TOW gun sitting there is the one you would want, but the builder left the stock blonde. It would need stripping and refinishing.
Much depends on the gun you are looking at and who the builder was. The Hawken brothers are the ones most famous, but they were only one of several shops in the St. Louis area. I have seen everything from no buttplate to a wrap over to the one now identified with the Hawken type gun. I have seen all three types of nosecap. I have seen no entry pipe all the way to very ornate skirted ones. I have seen everything from no cheekpiece to the almost modern beavertail. I have seen everything from very small bores to about 60 caliber.
On most the wood is pretty dark and if it is fancy, it doesn't show. Most use a trigger plate. Most have the slimline cast buttplate and most have the entry pipe with a fairly plain skirt.
None of the present guns combines even all of the mosts, much less the original weight, barrel length, or dark finish. My Mountain rifle would be a good copy of a squirrel rifle made by Dimmick if it was about 30 caliber. It would then also weigh in about right. As a 50, it is too short and the barrel is not nearly heavy enough. I think you could make excuses for everything else except the size of the lock. The lock is too small for a conversion gun which is what the drum would most likely make it from what I have seen.
I am sure there are guys here that can add lots to what I just posted and correct my mistakes if they will. This is a lot like the early long rifles. The details that are correct depend on where it was built and by who. I am doing two stocks right now for my guns and I still am not sure what nose piece I am using on either!