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I thought you were talking about using that for the entire outside skin, not just the rounded corners.
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Well, I'd do a monocoque shell less the steel frame. At ~$100 for a 4x8 sheet, with no expenses for finish work. (and clean-up).
But rolled strips like I showed could have been structural members on the edges with quarter-spherical metal caps welded to angle stock instead of square tubing.
Posting in Ecomodding Central, you didn't get some of the input you'd have had (from other posters about the Dryden van) by posting in Aerodynamics before you even bought materials.