And even with the 289m version you could have 10 ft decks I think. So scaling it up to around 327m would add a little bit more space between the decks and doesn't look oversized. That's why I prefer this scale. Although I would like the ship larger, I just think it would create the problems I mentioned in earlier posts.
By the way, another old thread I really like regarding scaling of the TOS ship is this one:
Another take on the Original Enterprise...
(this is page 28, scroll down a bit for a good cutaway view)
Concerning oversize, how do the windows on the refit-Constitution compare to those of the Excelsior on your last comparison chart?