Hi! i can help you, i'm already make some similar, (with microscopic budget) but in my country was not exist BSA or another great british bikes, in my country all motor-lovers build their bobbers with 2 stroke, 2 or 1 cylindred motorcycle engine called "IJ Planeta" (1 cylinder) or "IJ Jupiter" (2 cylinders) or 4 stroke "Dnepr" or "Ural" engines, they looking $%^&&in' awesome! even if it moved by the bullshit engine:D