[Allen]

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If you call this car factory original then anybody that bought over the counter parts has a factory original car because all the parts are original GM parts......... But the car was not built with those options and not sold with those options.

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I'm not quite sure of your comparison, because I think there is a distinct difference between over-the-counter parts installed by anyone (general public) and those installed by GM engineers before a car is released for use.

If it was documented that engineering and the assembly plant combined their efforts to create a unique package for that executive, the car has a neat heritage and could/should be labeled a GM factory original. Whether the line assembler or an engineer installed the parts, if it was done and documented at GM before it was used, it's a factory original.

If it's known that they again modified it after Estes gave up the car, that just adds a twist to it. However, restoring it in the form that Estes originally received it stays with the spirit of their (GM engineering's) intentions to get the program approved and makes it that much more interesting and valuable.