I would build a trike like was mentioned earlier, two up front and one in the rear with a diesel engine BEHIND the driver, leaving all the room ahead of it for passengers and luggage. The engine would be a three cylinder VW turbo diesel, similar to what is in the TDI new beetle, etc. The interior cockpit would hold three people, one up front to drive and then two staggered back behind him/her on either side. up front would be a storage boot, much like the 550 spyder has. The shell would be made of fiberglass and aluminum re-enforcement. Manual transmission with a 7 speed gearbox, all of them geared a little high so cruising speed can be maintained in a very low RPM range.
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