The flat track-specific seat and tail unit are from Saddlemen, and there’s a neat block-off plate underneath to tuck away any stray electrical bits. You might recognise the fuel tank as being a Sportster item,
Perched atop the hardtail frame is a one-off seat, with substantial springs to provide posterior support. In a previous life, the springs cushioned the valves in an Evo engine. After adding period-correct controls, Uwe had a rideable bike, and it looks like nothing else we’ve seen. The...