Skooch:
If you have ever put together a kit (or are inclined to do so) I'd say that you couldn't go wrong with the kit from Dixie Gun Works for their Tennessee Mountain Rifle ...
This is not a gaudy "all brass and glossy varnish" thing, if that's what you like ... rather it is a very "plain jane" working rifle - all iron furniture, etc. - just like the originals it recreates ... I have one of them, albeit righthanded, and they are very accurate, with a very functional and strong sparking lock ...
DGW actually discontinued this rifle some years ago - I believe it was because the market was limited, with most people wanting that flashy "brass and varnish" look (even though it is
not historically correct.)
HOWEVER, they had left-handed rifles in stock longer than the others (though now no longer listed) and
still have the left-hand kit in stock ...
http://www.dixiegunworks.com/product_info.php?products_id=11597
Another
really neat feature of this rifle ... it is actually changeable from flint ot percussion and back. The barrel has a stainless steel touch-hole liner which can be easily removed, leaving a suitably large (7/16"?) threaded hole into which a "drum and nipple" can be installed, and then a separate percussion lock (made to fit the same lock recess exactly) is installed in lieu of the flint lock. (As you are likely aware, this is exactly the way many original flintlocks were converted to the new percussion system, back in the day ...)
The percussion lock is also still available from DGW -
http://www.dixiegunworks.com/product_info.php?products_id=6122
- I don't see the drum mentioned, but I imagine they must have those too ... you'd just have to enquire.
I have also occasionally seen these rifles for sale used, so you
might be able to search out one of those with the left-handed setup ....
FWIW, here is a composite picture of my rifle together with close-ups of each of the locks in place ....