Thanks for the comments guys
I've adjusted the service ceiling down, though I don't want to go down too far since the Spitfire Vb floatplane supposedly had an estimated ceiling of just over 33,000ft.
I have no current plans for more Cyclone variants (though this version was a spur of the moment thing so I won't say no to more in the future). I'm not sure about good looking, but there is certainly a twin engine aircraft in the works