Carpy's getting $8 grand+ for his. Now he's worked for his rep, and he has a flair that people will pay for (not me). But he's willing to give em what they want. That's the rub. I worked in a drag race shop in my youth. To finance the passion, drag racing, we had to build and sell those terrible 70s choppers, high bars, extended front ends, King and Queen seats, puke. Does Carpy really like those hideous 16" 70s chopper rear wheels?
Your bike is worth $8k minus Carpy. So about $3k net. So you gotta keep the engine cheap. A really clean stock engine, ..
I'm out of my league here, good luck. I think it can be done.