This is one of the vehicles I saw at the Palo Alto EV Rally, http://ev-12.blogspot.com/
He said the build itself took about 2 weeks. It's a chopped up and rewelded bicycle, an etek motor, 4x 12v 18ah batteries. The bicycle wheels are extra beefy with beefy spokes, and the frame probably a bit beefed up.
Too bad its not a pedalec, I prefer still being able to pedal the bike!! That thing is gonna be fast, the geometry looks a little goofy though.
What else was there??? I used to live in SF, wish I could have made it.