I think he has an OS 1.60 twin, which sounds to me, like a real plane more than most.
I would like to see them in planes too, but like it was said before, it is the engine that is attractive to those guys not the package airplane/engine. One tough pill to swallow for FAI scale guys is the noise rule; the planes have to be pretty quiet. Put one of those noisy rotaries in a plane and you would be DQed even though they score the sound of the planes to be scale like.