Awesome! Considering the missile turret is at the bottom of it, I always thought it was full of ammo or something, but the textures back those windows up.

However....
Primary Fixed-location Facilities...let's refrain from doing that to any other parts of the ship until we've got the functional elements that
have to be situated in specific locations in place: Engine glow (I'd like to do this part as I have some special ideas for it) + engine room, docking ports (with functional piston doors!

), and turrets+internal turret mechanisms.
Deck MarkersOnce those functional elements are in place, we should close up the hull (except for the starboard side), and place temporary
markers for the decks (not complete decks, just indicators!) along the inside of the hull. Remember that the ventral & dorsal (top & bottom) hulls should be 2 full blocks thick, so take that into consideration. Here's how I'd suggest doing things (scroll the code box):
=============== - Top Hull
=============== - Top Hull
[ ] - Crawlspace for circuitry
[ ] - (2 block height)
=============== - Deck ceiling
[ ] - Deck
[ ] - Deck
[ ] - Deck
=============== - Deck floor
[ ] - Crawlspace for circuitry
[ ] - (2 block height)
=============== - Deck ceiling
[ ] - Deck
[ ] - Deck
[ ] - Deck
=============== - Deck floor
...
...
...
=============== - Deck ceiling
[ ] - Deck
[ ] - Deck
[ ] - Deck
=============== - Deck floor
[ ] - Crawlspace for circuitry
[ ] - (2 block height)
=============== - Bottom Hull
=============== - Bottom Hull
Primary CorridorsWith those markers in place, we can place some large primary fore-aft corridors. Perhaps 2 on each deck that has primary corridors*, and 7 blocks wide.
At a later stage, they could have the primary facilities placed between them (CnC, infirmary, mess halls, etc.) and secondary rooms on the hull-wards sides, so we'll place the corridors at around 1/3 and 2/3 of the ship's width.
* What do you all think about these primary corridors? Should there be a pair of them on every single deck that runs the full length of the ship, or should there merely be 2 or 3 of the full-length decks that have primary corridors?
Other Primary FacilitiesWith the corridors in place, we can move on to the other primary facilities that don't
need to be in any specific location... CnC, the infirmary, mess hall, arboretum, recreational center + swimming pool, etc. Each of these should have one wall (or perhaps a section of the ceiling) empty, for the placement of the...
Tour RailThe tour rail whould be isolated via a glass tube from the rest of the ship; walking tours will be available elsewhere, not by getting off the tour rail in the middle.
FillerAt this point, the remaining space can be filled in with decks, smaller corridors, and rooms.