Obtain a bike (or bikes) from which you will salvage the additional parts needed. I chose this Schwinn O.C.C. Stingray Chopper Jr. for the sacrificial bike. This poor little bike will be chopped and parted out for my Chupacabra build. The rear dropouts will be cut out and utilized on the new frame. As will the bottom bracket. The triple-tree front fork parts will be utilized and extended. The handle bars will be utilized and extended. The head tube, the seat, rear fender, and anything else that I can salvage will be also be repurposed.