I'm sure you're aware of these already, but I've found Big Jim's plans to be the best source available for the external model:
https://www.cygnus-x1.net/links/lcars/slade.php
Regarding the Rec Deck, those two turboshafts simply do not work at the 1000ft scale. There's barely more than a single deck's height available because of the curvature of the external hull:
http://danielgovier.co.uk/enterprise/2019/rec_deck_1.JPG
http://danielgovier.co.uk/enterprise/2019/rec_deck_2.JPG
For this reason, I've chosen to simply make them stylised lighting panels
Yes, I'm actually using Slade's blueprints as my main guide, checking against screencaps or photographs of the model and correcting for inaccuracies as needed.
You know, after studying everything more, I'm revising my previous statement of how I'm going to "try and make it all fit". It looks like I'll be forced to make far too many concessions with the screen-accuracy of the interiors to do so, which I'm not willing to do. Therefore, my interiors will not fit snugly inside this exterior model. For instance, I want to make the Rec Deck as seen on-screen (complete with a two-level turbolift shaft), and it would just be impossible to fit it within the saucer structure without altering dimensions of the room to a degree I'm not comfortable with. I still want to marry my eventual landing bay interior and docking ports with their respective exterior locations, but everything else in between will not completely adhere to the exterior model if needed to maintain screen-accuracy.
More work this morning, specifically on the lower bridge structure.

The texture is still temporary of course, and the smaller windows will be added later with height-based decals (to save on polygons and modeling effort). Like the lounge windows, I'll also be modeling the other larger windows on the model (the rec deck and botanical section windows).
I'm also going to cut in the docking port at a later time. I'm modeling this at it's 8 foot scale but will be scaling this up to 1000 feet near the end of the process, and it's at that point I will add the docking ports.
Oh, and I should note that I plan on crafting low-poly sets of my eventual fully detailed rec deck/officer's lounge sets to place behind their respective windows for the exterior model.