There was once was a company that sold plans for a variety of things; most of which was cars. The company was Robert Q Riley Enterprises. Their website is gone but their Facebook page is still there but inactive. The plans page of their site is still up but the links (when one wants to buy the plans don't work and I don't know how much longer the website will remain up) don't really work.
The one set of plans that I think is very close to being Smart Car like is the Urba car. It seems about the same size and shape as the Smart car.
One can see the general shape and size is very similar to the Smart Fortwo. The doors are definitely different than that of the Smart car.
While I do like the gull wing doors, I can see there could be a problem if the vehicle was upside down.
This shows the inside of the vehicle. It seems to have a similar propulsion system to that of the King Midget cars. It is similar to the Smart Fortwo in that it is rear engine and rear wheel drive.
Here is another view of the Urba Car.
I have read of some trying to get the plans for this and other vehicles by R Q Riley released. The designer's descendants - the designer who had passed away not long ago - are trying to get them released. I hope they are successful.
There seems to be an electric version of the Urba car but it seems to have a slightly different less Smart Fortwo style shape but still pretty good looking.
