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Also, would the cowling ring be natural metal?
I have a hard time believing the Kecay interpretation of the upper surface camo. Given that the later aircraft shown in the colour pic are DE/DG uppers with Type C1 roundels on the fuselage, I have a hard time believing that the earlier photos of MP499 (with Type A1 roundels on the fuselage) would be in the grey/green camo. DE/DG makes much more sense to me, with yellow undersides - IIRC that was the standard scheme for non-operational types (eg trainers).