The heat transfer via the outer skin sounds sexy but also complex and expensive. The air circulation required for classic cooling is most likely to be found in the wheel arches. Built-in fenders in the two front wheel arches could function as a heat exchanger via a circuit with cooling liquid. If the existing air turbulence is not sufficient for cooling, an air flow can easily be built up via additional openings and fans, which supports the cooling (even when standing).
The Aptera Forum