Agreed it's a gold mine, but it's really hard to find the good stuff. It varies from pencil sketches on a napkin, to actual running 3D-printed cars.
For instance the proposal to make a stock Model T Ford with a one-molecule thick graphene body. That's just nuts—they could as easily start with the Volkhart-Saggita.
The example you picked has a mix of some unlikely rotary engine, a page cribbed from the Edison2 and the picture you liked of a foam plastic tricycle. They actually exist in the quantities shown but are not part of this proposal. An example was demonstrated on EVTV, as is is an electric vehicle. I tried searching in evtv.me to find the episode without success. It was maybe 3 or 4 episodes back, but they are 2 hours long.
They are available with a electric motor on one, or both, rear wheel[s] and variable battery packs. Most of the body is foamed plastic so you can bounce them off pedestrians.
I can't remember the name.
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