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Just a few thoughts.
Taken out flat the same surface area of a radiator would need significantly more flat space to achieve the same heat transfer... that's why they do it that way.
My OEM Gen-1 ICE radiator has air flow frontal area of about roughly ~1.5 square feet ... but if I unrolled all the fins and everything out flat ... it has roughly ~9 square feet of surface area.
Cooling at idle is not an issue as the ICE usually doesn't run at idle.
Sense the body style effectively looses the ability to run a fan to increase the air flow rate ... larger surface area may be needed for fringe events like very hot ambient temperatures.
It would seem to me the body flat style may need a large portion of the surface area around the engine compartment ... hood , sides , etc.
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