i could of gone the rgs root with a goldstar 57 chassis i obtained,but lucky for me i found a dbd34 engine,so now i'm gradually collecting parts for a goldstar srcrambler,while in the meantime, making my mind up whether to do a full width hub spitfire, or again a half witdth hub a10 scrambler,good luck with the bike ,shearwoods are good for the cycleparts pearson for the engine,he will build it to your spec,be it 350 or 650.