In the Open Piston Warbird class of the European Air Racing Series, modifications to the aircraft are allowed - and needed if you take your racing seriously. A short wing Spitfire with the long Griffon engine is a good starting point. A low drag canopy is a standard feature in the Open class. This one also has the engine cooling systems re-located into the rear fuselage. Griffon powered Spitfires tend to be so nose-heavy that weight needs to be added to the rear anyway ... Might as well put something useful in the tail.