Strictly speaking, yes, but one can make an educated guess. Something might have been gleaned from Matt Jefferies’ sketches of designs not used. His original concept for the shuttlecraft could have been reworked into a different class of Starfleet or Federation ship. There is also the basic designs of ships seen not many years later in Franz Joseph’s Starfleet Technical Manual that Gene Roddenberry signed off on.
Still a guess, though. A guess from a different team, working with different methods and materials, with different production and editorial oversight, and informed by seeing 40 more years of designs and effects. You know better than I do the difficulties that were encountered in translating the shuttle concepts to something practical, and those kinds of constraints were much different for later CG modelers. So someone's guess is fine it that's what a viewer likes, but that's why I couldn't care less about TOS-R and feel it's important to note that those episodes are revised versions.
I don't personally trust the TOS-R educated guesses, either. I haven't watched much of TOS-R, but why does a shuttle have a wobbly sideslip when it takes off from the hangar deck and flare when it lands? Just bizarre and unnecessary choices.
Then there is the issue of why it would be done. We know that the inverted and condensed Reliant design was so viewers could tell which Starfleet ship was the bad guy. There were only two instances in TOS where that might be a problem, TDDM and TUC. But since more than one starship maneuvering in the same frame was probably out of the question, I'm not sure that a new starship would have been deemed necessary. Much less that it would be anything like a proto-
Reliant design.
Don't get me wrong, I would love to have seen more OS ship designs. I have had dreams where I see new episodes with new starship designs. But that door closed in 1969.
I believe FJ, not involved with the production, felt constrained in how far he could extrapolate other Starfleet designs, so he went with a mix-and-match of basic components. Which I respect on the fan art level, and indeed some of it was canonized in the movies. But putting those designs in TOS would still be retrofitting.
And note that other designs inserted into TOS-R were not likely to have been envisioned in the ‘60s either.
Oh yeah, I have no interest in those, either.
