As was mentioned, the "kits" from Track of the Wolf, Pecatonica, Muzzleloader Builders' Supply, Dixie and a number of other suppliers are far from drop together kits. They require a lot of work to put them together.
On the plus side, there are a lot of styles of stocks, locks, triggers etc that can, with enough time spent, create a good representation of the old historic guns.
Kits that are about 95 percent finished are available from Thompson Center, Traditions, Lymans and a few others. These are IMO great kits for a first time builder because they don't involve much more than sanding and finishing the wood and bluing or browning the barrel and polishing the brass.
They are however just production guns which were removed from the production line in an unfinished condition so the choices of styles are limited to what the factory makes as finished guns (mainly half stock rifles).
I would say a person who is handy with tools and wood finishing can make a commercial factory kit with about 20-30 hours of work.
A "kit" from a muzzleloading supplier like TOTW, PR, MBS will easily take the same person over 150 hours to finish.
There are also a few suppliers who make "finished in the white" "kits" where all of the assembly has been done so they need to be sanded and finished like the factory kits.
They have more choices available many of them being full stock rifles.
I believe Tennessee Valley Manufacturing is one of the suppliers of these guns.
zonie