OK, I took the easy route first. Steven had said "Of course, if feasible and possible go for the most original line possible but the main feature people are looking at is the short banjo, its finish, and if they are road legal."
If someone wants a DOT line, that looks close, the image is what you will get. We can't shorten the sleeve on a DOT line. They can however give me a custom neck length. They have a patented brazing process to accomplish that. Once brazed I'm thinking we could fill the band with a lower melt point tin solder or something similar. Drop it in the zinc, take it back to my guys and they will crimp it onto a DOT certified flex hose. It is tested past 3000 lbs and checked for leaks. 100% DOT and saleable anywhere that the DOT certification is recognized.
The pic is photoshopped so the images may not be exactly to scale. I'll need an upper line so we can get the length and banjo offsets correct. As well, I need it to get any manufacturer markings and crimp for the next phase, that being the non DOT line that will hopefully be very close to the original banjo's. (short neck, short sleeve, proper markings)
Lastly, if we are going to make a few DOT lines, does anyone have a Caswell home zinc setup or similar? I hate to send a few fittings to get zinc'd.