After reading a few suggestions I touched up this registry and added a little more information specs etc and after recent discussion and issues with Constitution scale I have given one suggested by Doug Drexler is 1100+ ft while in a chat with Star Trek Eire podcast and my own scale based on some work I did with my CGI model, it comes down to deck height and the number of decks, I gave my decks a hight of 10ft keeping with the visual aspects of the stage set. (perhaps I should return and try it with 9ft deck heights)
So the deck count I get at the scale I like 1246ft is 25 decks, and this count does look to line up well with windows in my model which I think is close enough not exact but close with some margin for error.. but I also like the description given in my first Star Trek behind the scenes book The Making of Star Trek by Stephen E. Whitfield (Poe) and Gene Roddenberry. 11 decks in the primary hull and 16 decks in the secondary hull which includes the dorsal neck, I get 23 decks which is also supported in Star Trek Encyclopedia, by Michael Okuda and Denise Okuda. so I have 2 additional decks, but I was considering that in the dorsal upper section and lower could have taller levels for interconnection machinery, in the top section between the two hulls and in the lower section a turbo elevator maintenance and storage.. anyway they are just two ideas open for discussion
The dimensions of the Constitution-class, 947 feet (289 meters) long for the original configuration and 1,000 feet (305 meters) for the refit-configuration, have been set in stone in time immemorial as far as Star Trek lore is concerned. That being said and oddly enough, neither dimension has actually ever been canonically confirmed, as neither dimension was ever seen or referred to in any of the live-action Star Trek productions.
The original configuration length of 947 feet was first derived from Stephen Edward Poe‘s reference book, The Making of Star Trek, p. 178, and that dimension has been propagated in every subsequent reference work ever since. However, what Poe did not mention was that designer Matt Jefferies had originally produced that graphic in 1967 as a reference for Poe’s employer, model kit company Aluminum Metal Toys for their 1968 second edition retooled USS Enterprise model kit, No. S951 – where the graphic was displayed on the side of the box prior to its publication in the book – and not for the actual Original Series production. Remarkably, the dimension of the starship had been in flux until that time as producer Gene Roddenberry‘s memo of 24 August 1964 evidenced, “We anticipate a final design might see the ship as 200 feet in length, and thus even a 1½-inch scale would give us quite a huge miniature.” This figure, initially accompanied with a crew complement of 203 would actually more or less stand until Jefferies, utilizing his engineering background, recalculated the figures for his design three years later. (The Making of Star Trek, pp. 89, 134)
This opens in my mind some area of exploration and expansion