I have the exact same "Twentieth Century" carbide lamp. Despite being produced and marketed as a bicycle lamp, mine was apparently used on a coal cart in a local coal mine.
Anyways, that is a REALLY nice looking bike. I like how you did the exhausts.
now, THAT, IS A VINTAGE MOTO-BIKE <3 only question i have is where is the fuel tank for the engine ? Todays electric powered bikes on so-called retro style city beachcruiser frames cannot even compete with this true oldschool styling and the ENGINEERING GREATNESS of this gas powered bicycle