You can assume all you want that he 'really' wanted the ship to have a 1697 registry, but there's no evidence that this is the case.
I never said I assumed such a thing. I said it would have made sense for him to want such a thing. There is a difference.
You're assuming that he wanted the ship on screen to be a different class only because of the registry.
I would advise against attempting to ascertain what I am assuming. I said I thought I recalled an earlier version of the script or something about its development that said the idea was it was a different type of ship. Which, if you think of it, would make sense given the apparent desire to differentiate it from Enterprise.
All we have as evidence is an AMT Enterprise model kit that was clearly standing in for another ship of the Enterprise's class.
No, we have a sketch of another Starfleet ship that could clearly be made out of those same AMT kit parts. I would say that ship might have been intended as the “stolen plans” ship in the scenes cut from Balance of Terror but a) the AMT model had not yet been made, and b) there was never any need to actually show that ship - unless it was intended to be the Romulan ship built from the stolen plans.
I don't even think that the '1017' arrangement was even supposed to be an indicator of how old the ship was. It was just an arrangement to distinguish it from the Enterprise.
Of course 1017 wasn’t intended to show how old the ship was. It was intended to differentiate it from 1701. But do you think a person is incapable of holding two complementary ideas in their mind at the same time? Do you actually think it impossible that, given the eight other numbers that can be made from “1701” - 1017, 1071, 1107, 1170, 1710, 7011, 7110, and 7101 - that some other consideration entered the person’s mind who decided what number it should be?
Let’s assume 7011, 7110, and 7101 got thrown out because they inferred something too far ahead of Enterprise. 1710 got thrown out because it was too visually similar to 1701. That leaves 1017, 1071, 1107, and 1170, and by chance or some other consideration, 1017 just so happens to be the earliest in that series.
Take that to mean whatever the hell you want it to mean. But if 7101, 7110, and 7011 get thrown out because they look too advanced, then is it logical that the earliest number was chosen without some thought to it inferring much older?