SillyScooter
A 1.8kW electric scooter built around RC aeroplane parts. Capable of travelling at 18mph without stopping, as there's no brakes.
Clasohlsonkart
A go kart built around a Toyota Prius inverter, a 2kW brushless motor and a former garden trolley from Clas Ohlson. This is still very much a work in progress, with the chassis hopefully being made from an actual go kart chassis to start with.