Steve, to your Post #5...
May I gently offer a thought? The wording which says, in effect,
any design may be entered provided the contestant has convincing evidence of the design's compliance, indicates that a design that does not comply may not be entered in the contest.
Yes, that's not a DQ, which is explicit disqualification of a model entered in an event, nulling any scores and a barring flying it (?again) in the event, on the day. The wording cited by Keith, and which you attached to your post, indicates that a model which does not comply with the intent of the Classic event, should not be allowed to enter, in the first place... If ineligibility is declared after registration, the contestant's event entry fee should be returned, since the model was not eligible to enter the event. And if any scores already had been recorded and/or posted, they do not count in determining event placing.
Practical considerations: it is theoretically a CD or ED function to intercept ineligible models before entry, but it don't always happen. If a model is "close" and "in the spirit" of eligible Classic models, acceptance is a judgment call. With the 10g pull procedure added to in-processing, perhaps that would be an opportunity for sharp officials to ask an entrant...
Since contests are for the contestants, not the organizers, a factor to be considered is how the rest of the entry in the event feels about an ineligible, or dubiously eligible model, being allowed. And, there, too, it is up to the contestants to speak up and have the officials consider what troubles them about a given model.
(Too many of us are reluctant to gripe to the officials who CAN deal with a matter; we'd rather dis the management behind their backs...
)
But, basically, Classic is for enjoyment, as spelled out in the intro to the rules. And as several mentioned, we have a reasonably effective level of peer pressure to help us keep close to the intent. The authenticity rules may or may not be in widespread use, but they "sort-of establish" an approach to up-grading a score for a more "authentically" built, powered and presented Classic model. Gross updates win fewer points...