Fixing the notch in the left side of the stock would be easily accomplished, if it offends you. Remove the barrel and the lock, use a rat tailed file to cut a perfect half circle out of that notch so that the top edges are sharp - a 3/8" or 1/2" file, or even a sanding drum on a Dremel rotary tool will do it. Cut a piece of walnut so that the grain orients just like the grain of the stock, sand it to fit, glue it in with Titebond glue or similar, and finish.
I'd have to see full length images of the rifle before I could make a comment on them compared to other factory offerings. In percussion, I suspect you'd have zero issues with component parts.