Fairly cheap motorized and enclosed trikes were a thing in that period, if you weren’t going after a knockoff of a Vespa scooter. The Citroën Prototype C, FMR Tg500, Fuldamobil, Heinkel Kabine, Isetta, Messerschmitt KR175, KR200 and KR250, Peel P50, Peel Trident,Trojan 200 and Kleinschnittger F125 were all similar…