Definitely dig into it--I have this vague rememory that the "big" carriers were authorized 48" tall hull numbers, the smaller & "Jeeps" were 36" and the rest of the fleet used 24"
But, that could be fickle memory, and not fact.
36" at 1/700 is 0.015" (1.3mm) tall.
You can be forgiven (unless there are rivet counters afoot ) for putting the ship's name on the stern, particularly when it's meant for a former sailor. Doing so in black at least gives a nod to the "paint it over" rules of WWII.
Hull numbers are picked out on the hull using 12" lengths of welding bead to define the edges of the numerals. Prewar ships with 96" or 72" numbers would get a second set of welds laid in.
Ship's names often had all the latters lines out in weld bead, which, in the right light might appear as a black "shadow" on the stern.
On thing, at 1/700, there's not going to be a lot of chromic difference between the Deck Blue paint, and the 20B Blue flightdeck stain. You may have to "play" with those (in teeny tiny touches) to get a little bit of distinction. "Scale Effect" will not be your friend here, and some artistic license must needs be invoked.
At 1/700, a 12" viewing distance is equal to 700' (215m) distance, which would blend colors together as they faded in intensity to the viewer (in real life). But, people will probably lean in close to a model, so, havign the fight deck "scan" as different from the metal-decked catwalks will improve the model overall.