I like the enthusiasm, but I have no idea how a community driven project would interface with the appropriate regulatory boards to perform the safety tests to make such a vehicle street legal.
Even if we got a prototype through that, the organization would then have to take on the burden of ensuring every build lived up to the prototype, and that would almost definitely go against the spirit of being community driven.
The DIY urban transportation community has settled on an even more portable solution called the "e-bike." It can tow a trailer of cargo or small kids, and makes city parking much easier.