I've just taken a cursory look at the P51d, and I noticed there appears to be only 1 upper wing, mirrored on both sides. This immediatly limits potential for reskinning, for example to RAF colours, as any markings must of necessity be symetrical.
May I suggest the AH2 bitmaps are urgently audited, *before* a large library of player skins are created, to ensure that all aircraft have unique areas of bitmap for each wing, port, starboard, upper and lower, ditto sides and tail-planes?