therealfoxbat said:I don't know if this will help, but in the DS9 episode "Trials And Tribble-ations" they actually came out and said the Constitution class has 21 decks...
That's not NECESSARILY a "show stopper" when doing something like this.
My perspective tends to be that a "deck" must be a contiguous, uninterrupted area. In my case, I often will have a "Deck14A" and a "Deck14B" to represent two areas on the same level but in entirely unjoined areas in that particular cross-section.
The question becomes... are those "two subsections of one deck" or are they two distinct decks? Honestly, I'd be more inclined to accept them as two distinct decks... I did it the way I've done it largely due to my desire to make my ships fit with established Trek Canon (tm).
That said... we've also seen ships described as having decks identified by numbers, or at other times the same ship decks are identified by letters. (For instance, the bridge is on Deck 1, but the two decks below that are called "B deck" and "C deck" more often than they're called "Deck Two" and "Deck 3.")
SO... another approach might be to have, for instance, the primary hull be by deck numbers and the secondary hull by deck LETTERS... thus giving you an even more clear manner of identifying which part of the ship you're talking about.
It's worth noting that David's drawing has 19 levels... but that there are two more levels in the primary hull which are disconnected from their "matching" levels in the secondary hull/dorsal, so technically this ship DOES have 21 decks as he's drawn it.
As Obi-wan would say... "From a certain point of view..."