Hey Man i love your work. Any chances we will see the Dominion in near future?
The Sins of the Solar Empire Mod "Armada 3" might be a good inspiration for you.
Would love to see those nasty ships in regular stellaris.

* Maybe as 2. Version of the cardassians?

dominion Cychreides dreadnought as Jugger
Dominion battlecruiser as Titan
Keldon / Mantis / Chimera / Hydra as Battleship
Galor / Manticore as Cruiser
and fregattes and stuff a mix also of both , pleanty options available i think.

https://startrekarmada3.fandom.com/wiki/Dominion_Alliance#Ships