I see how that is in the picture from your link. The whole outside of that motor casing turns, so it looks like you would have a gizmo that goes on the side without a shaft that bolts on to that part of the motor, and then the prop to that. So, the body sticks out as my diagram and the picture shows, and it would bolt with that shaft pointing in toward the firewall.

Did the motor come with that sort of prop mount?

cgr