You posted the pics from Richard Datin's website www.startrekman.us
and here is the corresponding text:
"A side view of the miniature reveals signage appropriate for the shuttle bay of the Enterprise. ...
[the next page shows the signage sheet fragment] Several examples of the Flight Deck model signage."
Here, again, is the link to the website with the complete signage sheet
(go to the end of the post from November 13, 2012)
The one thing everybody can immediately notice is that there is neither a "Warning Fire" or "Elevators" or "Fueling Station" among the signage sheet!
No either Mr. Datin (RIP) didn't know what he was writing about (would be in perfect sync with this retroactive "the creators didn't know what they were doing" manure) or the artist who recreated the shuttlebay miniature was just equally in the dark regarding the actual signage prior to 11-13-12 and therefore had to make it up.
If there is a better explanation I'm eager to listen.