Here my guidelines for building:
1) Predominant riding terrain.
2) Lookup and read local legal requirements.
3) Primary rider's physique.
4) Budget.
Do your research and stay within these guidelines and you'll have a bike you can enjoy riding. Good luck with your build.
Come on out to the races and you will meet most of the best
bike builders in the area and get to see just about every kind
of motorized bicycle that you could imagine.