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There's lots of history to look at. There were two SAE papers by Dr. Alberto Morelli that were published and led to concept vehicles. The first paper led to the Pinifarina body for the Fiat 124 with a road going 0.17 Cd. Popular Science did a cover story on it. The second is the Aptera shape shown earlier in the thread and discussed breifly by Dr. Joseph Katz in his book on racecar aerodynamics.
Seating can be side by side, offset with passenger seat closer and about a foot behind, or in-line as the GM Infinity. In actual driving, practical ground clearance is at least 4" and seat height is 20". The newer Aptera shape will likely see use over recumbent bikes and scooters.
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