Hopefully other projects can start based on the years we have put in to this and license with the ODbL or perhaps dual-license with CC-BY-SA. With luck they will never have to know how much work it took to get here.
The radical minimalism of these machines, built mostly in Europe in the 1950s and early '60s, reflected the region's postwar scarcity. (One resourceful builder beat old cooking pots into fender panels.) They typically measure 10 feet long or less, with less than 700-cc engine displacement and one or two seats arranged side by side or in tandem, scooter style.