That's a 13 3/4" tricker pull. The Chambers lock would also be an excellent choice, either smooth rounded or the raise carved one. Brandenburgs used both flat face and curved face locks. I filed a wider bevel on the face, but not quite as wide as the originals were. I think their plate might have been thicker to begin with.
I compromised on the shape of the trigger guard and the side plate, but they are not out of line for the school.
This has been a fun build, since it is entirely different from the customary longrifles.