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With my brass caliper and the screen (reduced to Normal from an eyeball friendly size) the Kamm K-car is 123% the length of the Beetle (I love that choice for baseline). Assume a 12ft length for your typical bumperless Beetle body and that makes the K-car 14.76ft. That's close to my own estimation of 3 additional feet (i.e., 15ft) to boat tail the body.
The full boat tailed body is untenable. Suppose for a moment that the K-car body has a Magic Butt Trumpet. Rather than a taper to a straight line, the trailing edge is a half-circular arc and the underside is half an exponential horn. It could even transition between square 'twixt the rear wheels and circular at the tail.
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