You can build a motorcycle trike from scratch using the Mystery Designs Rolling Chassis kit. They are offered in two different styles a 43 degree or 39 degree rake in the neck as shown below.  The Rolling Chassis Kit includes everything you need to build a trike minus the motor, tranny, electrical and paint. Other features include: our independent suspension system, our rubber mounted FXR style frame with 5" of extended length to the down tubes and 4" of stretch on the backbone, front fork, front wheel and  tire, fender, handle bars and controls, a 4.3 gallon die stamped tear drop shaped gas tank, 3 rear fenders or optional body kit, motor mount brackets, tail lamps, head lamps and mirror.