[Jspree]

Each VStar is specific to their engine, If you want to build your own, just buy a custom frame tabbed for that engine. Back in the 70's and 80's we could buy frames from a company called jammer. You ordered the frame and you told them if you wanted it tabbed or not and if tabbed what motor you were using.
Here is a company that makes custom frame for Metric Engines:

Motorcycle Custom Frame

motorcycle frames custom made for Honda,Harley Davidson,Yamaha,Suzuki,Kawasaki,Triump,

www.cycleonemanufacturing.com

Now you can take that Yamaha engine and make a totally custom motorcycle.

Here is a place with custom Metric Parts.

Shop Metric Motorcycle Parts at Deadbeat Customs

Shop Metric Motorcycle Parts at Deadbeat Customs Get Free US shipping on Metric when you spend over $100.

deadbeatcustoms.com