D'oh!!
Give that man a prize. I'm going to blame that mistake on the 14 years or so since I was in the otter.
The one we had was on a pair of B-18 floats though.......... Nothing like step taxiing that thing as far as I was concerned, but the cowling was like a jigsaw puzzle, no sir, I didn't like that cowling at all. One of our competitors had a turbine powered otter, man that thing looked good ( I think it was a PT-6 but I really don't remember).
As far as the center section heating up, it's really not an issue. The heat is centralized around the combustion chambers and cylinders just like on a flat 6. Any heat build up there (the center)is taken care of by the oil.
Pete