One point I would make is that the people who know real WW2 ships down to their bolts are not likely your audience given how wildly different this timeline is from the real one. You audience would probably be the same people who have already gotten attached in the earlier parts of the timeline and want to keep going. We aren't going to care beyond the basics and if you say that, for example, a given Roman fighter plane was single engine, has excellent handling for it's time but is somewhat undergunned compared to it's opposition, that would be enough to satisfy me at least.I remember reading somewhere (in PolChat?) where a poster was describing an interesting idea for a WW2 TL they had that they really liked but said they’d never write it because they lacked the ability and desire to do the amount of technical research that would make the crowd that knows the number of bolts in an Essex-class carrier happy. And I feel the same way when I think about this TL entering the industrial age.
The technical bits are flavor. They're great to have in moderation and when it actually affects something. The story is what matters.