Ah, good, no video was available to me at the time, just a vast screenshot library seemingly taken every half-second or so. I'll assume that's all you meant by "selective images".
The helm console overlay shows the proportions of the two ships that clearly matches those seen here.
which, even assuming 750 m for Discovery
, DISC Enterprise
is no more than 388 m long.
The helm graphic doesn't quite match the CGI in scale or positioning. Per tweets from production staffers, they had to make the console part literally months before the CGI work was done and were amazed it matched up as well as it did.
Deck heights don't help the case because the original TOS Enterprise had similar deck heights, more decks (23 for Connie versus 18 for Crossfield):
Claiming high decks for sets without ceilings is a favorite technique for TOS Constitution re-scalers. It's a popular hobby on TrekBBS to try to make the Constitution up to 450m long by taking the tallest observed deck height and applying it to the whole ship whether or not the windows line up. I consider the maneuver on par with re-scaling the TOS shuttle from 24 feet because the interior set was larger than the exterior . . . it's taking a necessary production cheat and trying to override everything else from it.
The deck height I'm pointing out is not from interior sets, but the CGI of the ship, where the windows all line up nicely from bridge to keel.
Per info provided early on from the producers, the ship has 17 decks, but it visibly has 18 deck-worths of height . . . the very bottom deck-height (at the keel) has no windows, though, confirming the 17.
At the deck-height shown, the behind-the-scenes info of 750m is confirmed, despite any insurgent rescaling efforts.