If you’ve passed Traif Bike Gesheft in South Williamsburg recently, you’ve probably seen Hayden Cummings on the curb, tinkering with some sort of bicycle contraption. He’s building an engine and trailer for an around-the-country bicycle journey, during which he will perform as a one-man band (the trailer will have a drum mounted in the side and Cummings has made a guitar out of a camping stove—a functioning camping stove, that is—and he’ll also have his saxophone and flute tucked in the trailer) and generally travel the country without spending money. He is homeless, dumpster dives for food, volunteers at community centers in whichever city he is inhabiting, and has salvaged all the parts for his contraption. The engine will run on salvaged biodiesel, waste vegetable oil, and solar energy. Cummings has also set up the battery and engine so that he can pedal-charge the battery by placing the back wheel on a stand and pedaling. When we stopped to talk to him, he gave us more details than we can reproduce here, but if you stop by the bike shop, you can always ask him yourself—if you stop by soon, since he’s planning on departing shortly.