Do look up Craig Vetter's stuff, but be aware that light, streamlined shapes can get blown around in a crosswind. A simple front fairing that you can tuck in behind won't generate much side force. If you adopt a single riding position, you can add a tail box to increase streamlining and luggage capacity. Light construction is important, but effective shapes will always be worth any reasonable weight.
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There is no excuse for a land vehicle to weigh more than its average payload.
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