It felt hard to the touch (that's what she said), when I fondled, ERRRR, examined the one I took pics of... they were definitely cast/resin.
Also, fun fact - I FREAKED Dinah out when I was twisting the cockpit 360º taking pics... she had no idea it did that, lol. Couldn't tell if there was a motor/servo in there, but it was stiff when I twisted it (that is also what she said).