The 36lb/hp came from an article by SAAB engineers in the 60's as the optimum weight for a passenger car. In a sports car that would be lower, as in the old SAAB Sonnet 4 cyl. fwd. Richard Ridley sells plans for trikes that could be adapted to a moncoque design.
The 4 cyl. dune buggies have 24" suspension travel. Seat angle will depend on the suspension and muscle tone of the back. See Mark Martin's exercise book.
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