I am very late to this party, but I will say this. Nick at Vulcan does top quality work I have sent in a bunch of projects over the years and have been more than happy with the prices and the finished product. I have had the same process done to one of my SA M14 bolts and there has been zero issues.
Seems like a lot of good work has been done to this rifle already, all the normal fixes plus the more advanced stuff like the op rod tab and bolt and unitized gas system which is all great and I would think it certainly adds value to the rifle over a stock unmodified norc.
The only problem I see would be finding the right buyer. Some folks may want an entry level m14 clone and want it to work correctly and not have to do any work to it. This rifle would be great for them however, the cutting down of the barrel and the addition of the Dlask parts may throw some people off. Especially people who want the classic look of an M14, they could buy this yes but they would have to spend additional money to get the classic look of the gas system and flash hider back unless you include those parts with the sale. If someone wants a rifle with a 22 inch barrel than this it may not be worth it to buy this build and then buy another barrel.
The key is finding someone who wants this exact look and that can certainly take some time to sell, but to the right person it would definitely be worth the price. I would say you should be safe to ask $800-$850 ish. I know good money has been spent on the upgrades but its still a Norinco and its still used. They simply do not command the same value as an SAI or LRB, Fulton etc. Now if it was a Norc receiver and was rebuilt and was chalk full of USGI parts then that's a different story. A GI fiberglass stock cant really add to much more to it if its the only GI part.
It definitely sucks selling off something that you have put the time, effort, and money into. It's hard try to recoup all those costs.
Just my $0.02.
CeeJay