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connecting the "corners" would be a creation... almost artsy.
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Four quadrilateral flaps and the corners filled with cone-shaped inflatables?
https://i.pinimg.com/originals/88/2e...73ada468a4.jpg
IIRC, fineness ratio is for the compound curve Template. With torpedoes or truck vans, once you exceed a length where the disruptions at the front have found reattachment, it's all the same. See Mair.
If your
d is 7-8ft, a 36" box cavity would be minimal.