G.T.,
Nudge........nudge...............
............you too can do it......
I have long thought about building such myself, like to have the original barrel length on my rendition, but as we know, takes the paperwork, stamp. and $ over the rest of it. I could live with the 16+ incher with no problems.
A while back I made up a 16" plus barrel, tapered from an old 06 rifle barrel for an old Navy Luger receiver/frame etc. Tapering a barrel is not a lot of fun, but doable for the average reserver. Just a matter of watching the lathe run, doing the math, and keeping the specialized cutter........well, sharp; some attention to speed and feed come into play too.
The availability of a buttstock in semi inletted form is a great boon, at least to me. Checkering is out of my league; no eyes here. The fitment of the attaching iron(original or repro) is there just to be done, all takes time by hand if you want the hairline fit. I am sure you are no stranger to marking medium.
The forearm seems to be screwed on to the hanger. I would have to admit the cross wedge of the originals probably is a task in itself; both look nice to me, personal choice there.
The metal work is not too bad effort-wise, fabrication of the barrel, front sight, and hanger are tasks that will try you a little and take time. I always wondered on custom stuff how high to make the barrel's front sight, guess measuring from bore line is one way. I suspect there are more intelligent methods out there; which I am sure you already are massaging.
This particular rendition of a repro carbine is nicely done, the group should be rightly similing of how it turned out, nice job.
You, I am sure; have all the background and skills to do it yourself, just now where is the time I guess. Likewise, I am sure you are way ahead of me in technique/approaches, but wanted to comment how nice this rendition turned out. Mine has been put on the backbuner for about 15 years now, but .............someday I will blast off and do my own version...........in a 30 of course....