RE: Nitro models pusher Bobcat?
The ST .90 has a removable front housing but I have no experience running engines backwards. Agreed that the ST doesn't seem to be the correct engine for the airplane.
The Cessna 310 is a very pretty airplane but the wing loading was frightening. However a friend put OS .55's on one and has 10 or so successful flights. The landing speed calculated to be above my skill level. You probably won't have any difficulty.
Another friend has a beautiful Bob Cat that was flown once with a 10 pound thrust turbine. The weight without engine and servos is 7 pounds 9 oz. The wings were sheeted and the airplane was painted.
Bill