building a banshee from the ground up will be very expensive. you would be best off to get a roller. elkas and a set of aftermarket a arms will run you upwards of a grand or so. not much motor work as in what? heads cost around 250 with domes, porting anywhere from 200 to 600 or so, reeds about 200 and so on...and if you were to build fro the ground up you are talking all the electrical, nuts, bolts, linkage, pegs, stem, radiator, bars, swinger, chain, hubs, break assembly, the list goes on...