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Since the closest fit is at 0.314 Cd, it appears that the tapered Airstream might have 0.263/0.314 or 84% the drag of the donor vehicle. Replacing the back window with a door would create about the right amount of taper.
I never intended to keep re-posting that manila folder and masking tape model. It was based on a 4x12' sheet of plywood with 4', 3' and 5' bottom edges.
I shall revise it into a 20'er with 4ea 5' bays. The first a wedge, the 2nd a straight barrel section, a third with the [single-axle] wheelwell and taper in plan but not elevation, and the 4th as a transition to a Gothic arch.
aeerohead can confirm I'm heavily into Gothic arches.
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