Piw,
Curious what's so aero-special about the Cultus/Swift/Metro (+ Smart). To me it is a very conventional two-box hatchback. It's high FE is because of its very low weight & three-cylinder power. I was going to try to make a Smart-etro but there was nothing special about the shape/s.
By the way, I've always been intrigued by the famous Bucky Fuller's Dymaxion. The PSed 'Smartera' was a logical 'knock-on-the forehead' Frankentstein experiment. Putting together a clean but very compact front-engine compartment/passenger cabin with a beautifully formed tapered end. This could be a tribute to that 'ahead-of-its-time' aero-form.
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