Mitch, you've done a very nice job on the rifle. It is instantly recognizable as a Hawken rifle, and the fit and finish is excellent. I do not consider myself anything close to being an 'expert' on Hawken rifles, but I've studied everything I can find on them, as well as a very cool original that Don Stith graciously allowed me to fondle and photograph. So I have some very strong opinions about their architecture.
This is the hard part...partially for the above reasons, and partially because no two of them are exactly alike. I feel that the comb on your rifle is just a smidge too high, and perhaps a little too rounded at the transition to the wrist. On almost all of the rifles I've studied, the comb is quite thick - not shaved down to a knife edge, and though you have not provided a photo from above, the profile gives that suggestion.
I commend you on the perch belly of the underside of the butt stock...it's about perfect. The cheek piece might have been left about 3/8" longer toward the butt plate, and the termination at the muzzle end, finish a little below the wrist's centre line. The Hawken rifle is much deeper though the lower forearm than Kentucky rifles, and most other muzzle loading rifles, for that matter. So it's tricky getting the lower lock panel in proportion to the panel above the lock plate. Your lower panel appears a little wide, but that's really nit picking. But the panel for'd of the lock's bolster is too heavy/wide. Many Hawken rifles' panels begin as you have done: a slight radius for'd of the lock's bolster, blending in to the horizontal plate and then extending past the nose of the plate, just as you have done. But that area just above the for'd part of the plate appears a little too wide, to me.
Finally, and again this is really grasping at straws, your forearm seems to me to be a little short. I know that some were made just as you have done, but with that long barrel - what is it, at least 36"?...the forearm might have been left a couple of inches longer.
None of this is meant in disrespect for the great job you've done on your rifle, Mitch. I love looking at Hawken rifles and yours is no exception. Thanks for posting .