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It'll be interesting to see what kind of mileage you could get from a smooth and curve optimized version of my car, just like the speed difference you see between Van's RV-6 aluminum and a Glasair III fiberglass kitplane.
But for my daily driver which needs to be back on the road quickly after being damaged, metal construction works best since it doesn't have the temperature and humidity workability restrictions of working with epoxy (to say nothing of the chemical odor). In the over 150,000 miles I have driven this car since aeromodding it, I have hit 2 deer, a raccoon and a sign post. Afterwards I was able to quickly repair the damage despite the weather and outside temps (I don't have a garage). Sheetmetal can be worked on when its 15 degrees F outside in the winter or 90 degrees out and drizzling in the summer, a freedom I wouldn't have if working with epoxy. And once the last pop rivet is in place, its ready to roll, without all of the lengthy curing and finishing times required of epoxy. So for rough and ready work, metal is best, but for optimum performance you can't beat fiberglass.
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