In my experience, getting a prize-winning prototype on the road is just the start of one's troubles. Build a better mousetrap, and the world will indeed beat a path to your door. However, most potential customers want the high-production price, and the potential investors want to be assured of any profits. And lots of people just want to sell you something you can't afford. Free publicity still costs you a lot of time, and increases follow-up correspondence.
I'm not fond of cars that have large, general-purpose spaces inside, instead of being optimized for a given drivetrain. A test platform for engine efficiency is more convincing if it is a known car model, although a trike helps it get noticed. I'd concentrate on gathering enough information to refine the design, and building a lean but well-balanced organization to work on all aspects of the project, without letting it get co-opted by other, private agendas.
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