That looks really good!
This project did not involve altering an intact rifle. The barrelled action came from a rifle that had been altered, its barrel and stock having been cut. Bore is perfect. In other words, an ideal candidate for a custom build. The forend wood was all used, salvaged, grungy, as were the bands. Pre-1898 did a great job of redoing these.
Here is how the barrel was done - after being trimmed to the desired length, the muzzle section was turned to the same diameter as a standard rifle, no lugs of course. Like a No. 7. A front sight base was bored out, so that the lugways were gone. A piece of 4130 Cr-Mo tube was turned to a nice fit in the front sight base, and soldered in place. Both sides were faced off, and the sight base was bored for a drive fit on the barrel. A hole was drilled and tapped down through the sight base for a locking setscrew. The hole for the front sight protector screw was opened out.