I suspect they let the internal structure dictate the external form.
http://porsonly.com/matrix-143-porsche-troutman-barnes-911-4-door-green-1967/
The Troutman-Barnes 4-door 911 (in 1/43rd scale)
Quote:
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The fastback form has the lowest possible drag only if it has the 40-degree minimum tumblehome
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Measured off the vertical or horizontal?