Oops! I said parabolic. He actually used a catenary curve. Not being a conic section catenaries are hard to calculate. So he used upside down models and inverted them.
It would be hard to reproduce his work elsewhere because his local craftsmen were pretty magical themselves. The attic of
Casa Milá:
ibid
Would you like to know more? Here are PDFs of the geometry behind Hotel Attraction and Sagrada Familia.
Documentos de Manuel Hidalgo actualizados en Scribd [McNeel Wiki]
The Hotel document uses the phrase "Parabólicas elípticas de revolución" so maybe it is a parabolic design.
Quote:
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what shape do you think will fit better?
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Car shaped.
Seriously, on a car this small you don't have a lot of options/opportunities. It's all wheels and roll bar. You could extend the nose and tail and maybe put a curve in the rockerpanel area like the Ford Indigo. Minimizing the frontal area would have you just shrink-wrapping the frame, air-foiling the suspension and roll bar, and panting the wheels.