Ohhh...The Nebula-Class, the Nova-Class, the Kelvin-Class. :D

Kelvin.
Korolev.
Akula/Hermes
Okinawa.

Federation Class as a large hull
Saladin Class as a small hull
Ares Class from Prelude to Axanar as a Medium Hull
Loknar Class as a small or Medium Class
NX Class as a small or medium hull
TMP Enterprise as a nice compliment to the TOS version you already created

I think a cool addition to this would be a Terran texture version. With the yellow or red markings like seen in the TV series. Idk how much effort that would be, but it would be great for players looking for that "authoritarian" style while keeping the immersion.

Just a thought, and great mod!

Perhaps the TOS Constitution and the STO Odyssey classes?

Kelvin timeline please

If you choose to do SCX compatable in the future might i suggust:
Carrier: STO Jupiter class
Dreadnought: Galaxy-X or STO Odyse

yeah that reminds me, could u add STO ships?

The are tones of STO ships, which look cool (and have similar customization options).
Corvettes (2 more possible):
Aquarius Light Escort (from STO)
Mercury Tactical Pilot Escort (from STO)
Destroyer (1 more possible):
Walker Class
Cruiser (1 more possible):
Exeter class (from STO)
Strike Cruiser (3 more possible):
I would actually make ships like the Defiant & my suggested Mercury Tactical Pilot Escort & Aquarius Light Escort part of the Strike Cruisers
Escort Carrier (only one version):
I would love to see the Earhart Class (from STO)
Battlecruiser (complete):
Battleship (3 more possible):
Odyssey Class (from STO)
Avenger Class (from STO)
Nebula Class
Carrier:
Jupiter Class (from STO)
Dreadnought (instead of Voyager Saucer):
Guardian Class (from STO)
Titan:
Possibly the Odyssey Class (from STO)
Flagship:
Universe Class (from STO)
Exploration Cruiser (as you can theoretically set up to 15 different)
Voyager
Nova
Dauntless
Oberth
Olympic Class (from STO)
Nebula
Luna
Starbase / Habitat:
A spacedock-type Starbase (like Starbase 74)

So I guess you should have enough suggestions. If you possibly want to add ships, which do not use the vanilla or nsc ship classes I would be willing to write a mod that would add even more classes e.g. temporal ships like the wells class.

im thinking picards new ship from star trek picard . another is the challenger class. the apollo refit and both versions of the proxima class from star trek legacy

I know a lot of folks won't like it, but perhaps the Doomsday device (or some other 'Neutral' planet destroyer ship) as the Collosus?

Starfleet isn't exactly well known for its planet destroying ships, and using JJ's black hole traversing, time travelling mining ship seems almost as bad as totally screwing up established canon as a plot device just to give motivation to a totally one dimensional antagonist... but I digress....

So I pretty much second what RevansSchatten says. As long as you don't put the Universe Class in... (Enterprise - J - ENT: Azati Prime), and any Kelvin timeline stuff maybe would go better in a separate set? Like someone above said, each time period/show has kind of a unique feel to it and the cartoon-like nacelles of JJ don't fit so well aesthetically with the late 70's/early 80's style of Constitution refit, Miranda and Excelsior classes.

Ultimately, though, I want to say that even if you never add another pixel to the mod, it's amazing. Thank you so much!

So I know there is a possibility to change the models of the megastructures... would that be a posibility?
For the Sentry Array you could use the Argus Array.
The Science Nexus, Mega Art Installation, Strategic Coordination Center and Interstellar Assembly could be various different space stations.
The ringworld is a bit difficult, possibly a model inspired by Yorktown... but this probably is a bit too crazy, as it would be gigantic...

If you want to get some pictures from Star Trek Online for some new ship classes, I'd be happy to send you images (from all sides in the different configurations)

hmm you have 2 defiant classes....one for the interceptor and one of the picket ships i was thinking relpacing one of them with either the Apollo refit from the motion pictures era which i guess has a smaller connie refit saucer section with a single nacelle at the top and at the bottom toward the aft of the saucer section or the Neptune class from enterprise which are the first corvettes from st new horizons

I know Titan has been a pretty debated design for your mod.

The baddest ST ship I could come across in recent years is the USS Vengence from ST: Into Darkness

https://memory-alpha.fandom.com/wiki/Dreadnought_class
https://memory-alpha.fandom.com/wiki/USS_Vengeance
https://pwimages-a.akamaihd.net/arc/46/e2/46e2f084e185e12e7bb4fd76db744c321567210984.png
https://pwimages-a.akamaihd.net/arc/c1/91/c191b8af0d2b1936c27d38654be0066a1567210887.jpg
https://i.pinimg.com/originals/53/9c/75/539c75e70d1f069238e2023803ef61c6.jpg