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NACA did not have any drawings for the Spitfire and specifically state that their measurements might have been in error -
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Correct, the NACA did their own weight and balance analysis so their numbers might not agree with the RAF's.
That has nothing to do with flying the airplane outside of the CG limits.
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without a weight and loading diagram of the specific aircraft tested there is no way to know whether the aircraft was teetering on instability because it was loaded beyond the usual tolerances.
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You don't need a thing from the manufacturer to do a weight and balance analysis.
Your leap of logic requires some pretty hefty suspension of belief. One would have to assume the NACA was incapable of doing a simply weight and balance analysis and constructing a potato chart. That is something every homebuilder in the United States does in his garage. A weight and balance analysis and constructing a potato chart is also something every FBO is capable of doing. It is a routine process in aviation.
You need a few simple tools and the knowledge to run the math is all. It is obvious you don't know what you are talking about but are only trying to muddy the waters in defense of a gameshape.
You do not understand the process and do not realize the datum point is just a random point picked to begin measurements.
So what if the NACA picked a line of rivets that is ~5 inches away from the one Supermarine chose on the back of the firewall instead of the front.....
The reference datum point can be anywhere the person doing the weight and balance analysis decide's to put it.