I think the carving is somewhat amateurish, and that's why I said the last one he made.
Shelby could be right on the enhancements.
As for the patchbox, what can be seen of the engraving, is Dickert style and is also on his other rifles, and the PB latch looks good as well. I can't see the hinge well enough to tell whether it's correct. In the pictures, the door looks a slightly different color that the side plates.
Lastly, the signature on the barrel looks good and strong.
PS. On second look, I think most of the incised carved lines on the cheek piece side were cut well after original. I would think the original is the incised carving ahead of the cheek piece. And the dark colored semi double C behind the cheek piece. Most of the remainder; after the fact.
Here's a better pic. Click it for a better view.
