If you believe the experts, then this is already happening as we get more obese my the minute and supposedly moreso than Americans, but news for the experts, I've been there and we aren't anywhere near as fat as they are.
I thought they retired "Wunala" or whatever it was but I swear I saw the red one in Melbourne at the Tulla terminal last week. It was very early so maybe it was something else similar.
The 10% colour rule may be aircraft specific to some composite aircraft and is an manufacturers requirement.
Good call 43inches and I suspect you are exactly right - this was indeed an American manufactured composite GA aircraft I was referring to. Probably the same reason why Jabiru's can only be predominantly white in colour, so they don't melt in the Aussie sun.