I wondered how they solved the gaping space behind Pipes's head with reuse of the Huffer mold. It looks like somehow the cab can be rotated so that back of the cab, with the white rectangle and Autobot sign, sits behind his head, as opposed to Huffer who has the gaping space over his head due to this being the front/inside of his cab. The original G1 Huffer and Pipes were actually back to front - the front of Huffer was the bottom of the truck, while the front of Pipes was the top and so their cabs were situated differently (also why their arms/smokestacks point down vs up).