Guy 2: I would suggest that, instead of using the silly Franz Joseph "official Starfleet font," you feature the ACTUAL font used by Starfleet in the series (the font used on visual log recordings like in "Court Martial", which also matches the font on the hull).
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You're absolutely right, Square 721/Microgramma/Eurostile was not used until FJ's Manual and Blueprints in 1975. Here's the entry from Memory Alpha.
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Here are some modern options for the registry typeface on ship hulls. They're really good and I'm glad to have them on hand.
The problem for the book comes from typesetting for legibility and readability at text sizes. A blocky, all-caps font is great for numbers or the single word of a ship's name to be read from a distance. Like the naval ships Jefferies adapted it from.
It can also be good for headlines, though I wouldn't say so in this case. As I said, it's blocky, and its letterforms don't lead or flow into one another to carry a reader's eye across the page.
There's also only one weight to work with. That's hard on the eyes. As is the IBM Selectric style all-caps typeface on the all-text pages at the front of the book, and the Leroy mechanical drafting lettering on the technical drawings.
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So, that's why I believe Franz Joseph Schnaubelt did Trek a considerable service by choosing Eurostile, a 1962 update to the previous Microgramma which added lowercase characters to its various weights.
https://en.wikipedia.org/wiki/Eurostile
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Far from silly, Eurostile has multiple weights, roman and obliques, and upper and lowercase. This makes it an ideal typeface family for the many different types of information present in the Tech Manual. Modern, technological, flexible and easy to read when set at text sizes, it evokes the future as we understood it throughout the 1960s. Think of the 1962 Seattle and 1964 New York World's Fairs.
Compare the original pages with the new ones. You'll see the all-text pages at the front of the book united through common design language with the technical illustrations now. That's a definite improvement and it sets up the move into the design language of the TOS movie era, which used the Eurostile family. Those designers knew a good thing when they saw it.
Finally, using the hull font with Eurostile would be a clash in typestyles, but I'll gladly use it on the new illustrations of the ships.