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Heres an idea
Take an old pickup cap - and cut the roof open like a giant sunroof and then create the whaleback slope within the cap by hinging the leading edge of the cut out material? From the sides it would still look like a normal pickup with a cap. From the back you'd still have the top rear of the cap in place but the rear window would be folded inward to meet up with the hinged cutout to complete the whaletail. (Reinforce where needed.)
Lift everything back into place and latch to use the cap as originally intended.
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