If I were building these tanks for a living....i'd be out on the street. There is not much profit...hell the monza caps along are close to $100. Building these tanks, building the vintage bikes and "RACING" the vintage bikes is purely a hobby. When I have a chance after job
Maybe you should change your market. Those tanks are very nice. See if you can market them towards street riders. Or start making tanks for the more expensive vintage racebikes... ya know, british crap.
Most racers running japanese bikes are cheap bastards racing cheap bikes because it's fun and don't worry too much about looks.