Hi Steven,
Welcome to ALR. Making a lock and barrel from scratch is an accomplishment not many have done. Congratulations. Your file work and inletting looks good. I have a couple of suggestions that might improve the looks a bit. I would add another screw in the barrel tang, as Smart Dog suggested, but I would countersink both holes and install dome-headed countersunk screws with a single slot. Are the lock screws made for a phillips and slotted driver? I would replace them with a single-slotted screw. It may just be the camera angle, but your ramrod appears to be buried pretty deep in the stock wood. It will make the forearm look slimmer if at least half, or even a bit more, of the ramrod is visible from the side.
On your next gun, stretch the lock panels out a bit on each end, maybe end the rear of the panel with a point, and make the top and bottom even a little narrower. All the same width all the way around is less pleasing to the eye.
Keep up the good work.
-Ron