Roger, that looks like a pretty neat rifle. I'm curious about the butt plate, since you are asking for critique. I know nothing about southern rifles, but I know what I like, and I like butt plates that are filed thin. Yours looks a little thick to my eye, though the pitch is great, as well as the comb.
I don't have a better sparking and reliable lock than my Chambers' Late Ketland. Good choice. Thanks for posting your rifle.