Obsidian, I did a thorough remake of a GPR flintlock several years ago, and the link to the work should be somewhere in the archives here.
There are several things about the rifle that can be really improved upon to make it look more authentic. There is a hump at the breech because the tang needs to be bent immediately at the break-off. Bending and reshaping the tang, then re-inletting it down into that humb, and then file the wood down to the metal. While you're filing, remove the bevels off the side of the tang so that it is flat across.
Installing a L & R replacement lock will hugely improve ignition , though I've seen a couple stock locks that functioned pretty well. The lock panels need to be dressed so that they are narrower along the top and bottom, and shaped up better at each end. Study pics of original Hawken rifles for inspiration here.
Likewise, the cheek piece should be reshaped and the wood around it cut away to define it. These rifles are finished on a slack sander, it seems to me, so that no sculpturing of these important areas is done on the factory wood...thus no hand work is required, and production cost is lowered.
Take some of the perch belly out of the bottom of the butt stock; a little goes a long way. There's more but I'm called to the breakfast table...later.
