I would love for a modernized pre-dreadnought hull to be possible for Germany between 1920-1930.
It would make it much easier to recreate the Deutschland class.
I think it would be easy to implement since the hull already exists (or almost) in the game
Also superstructures more compatible with the Scharnhorst class and the H class.
Camouflages for ships would be an interesting addition.
I think it could give buffs to decrease detectability, while also decreasing the enemy's aiming speed.
I particularly find the aircraft carrier idea interesting. I know not everyone likes the idea but this implementation could be sold as a separate DLC. Sorry for my english, it's not my native language