In building this rifle, I scaled the parts and dimensions from a life-sized photo I had made of it, with Jim Gordon's permission. It is from his book "Great Gunmakers For the Early West, Vol III".
The keys go in from the right and are captured. I cut the head size down and made my own escutcheons.
The rib is riveted on. I made my own rod pipes. The rod is 1/2" inside the stock, a little larger here.
The lock panels are tapered, wider at the front.
The barrel is browned with Laurel Mtn. Forge Barrel Brown Degreaser, 5 coats, boiled in distilled water after each. The breech plug, tang, nose cap, entry pipe, keys, escutcheons, lock, trigger and trigger plate, butt plate and toe plate are heat blued.
I made the lock bolt escutcheon.
Track's Bridger butt plate was cut down to match the original Bridger and Carson butt plates.
Muzzleloader Builder's Supply 1 1/8" cast nose cap is correct but oversize for the 1 1/16" barrel (tapered) here. I had to solder a filler in to fit the cap to the barrel, and to raise it level with the under rib. It is screwed on from the inside of the stock, so is the entry pipe. The pipe is cut down from Track's to the dimensions of the original and drilled out to .500 inside. I made my own escutcheons to match the originals.
I modified the snail to the top curve of the originals. Reshaped the trigger plate. Reshaped the trigger guard. Cut the triggers off shorter.
The rod tip is brass like the original, but I made it with a 10x32 hole for a cleaning jag.
This is a Colerain barrel, tapered from 1 1/8" to 1", 31 1/8" long ahead of the snail. Only six lands and grooves instead of seven on the original Hawken barrels, but it is what I had on hand. I coned the muzzle about 1/4" and filed the grooves deeper, somewhat like original Hawken muzzles.
The rifle weighs 10 pounds even and I have to use a rib support to shoot it. But it goes where it was pointed, it is easy to hit with it. See "A Uintah Mountain Peep Shoot" in the shooting forum here. With research, sawing the stock out of a blank, modifying or making parts, I probably have 300 hours in this build. But now I know how to do it.