I dig it, but I think the Rhoades car has more cargo capacity.
http://www.rhoadescar.com/jumpshow.htm
In my little town this would suffice for probably 50% of our daily driving, but I would be a bit nervous about taking it out on the road. Not much protection for the family unit from the cell phone obsessed SUV drivers.
Unfortunatey you have to know that as soon as you pedaled one down the bike path there would be a referendum to stop the "scourge of the 4 wheeled monsters". As soon as we make prairie dogs a required part of every home I'm sure those people will turn their efforts to getting wheeled vehicles off the bike paths.
Wait. What? Took my own little tangent there trying to lurk less and contribute more. Since I don't have any real knowledge to contribute, this is what you get....
Anyway, I like the concept. I wonder how low you could gear it? With a couple people peddaling and just some gear in the back, I wonder what kind of trouble you could get into.....