double hull catamaran modular design - available in 3 to 5 hull size configurations.
Mid level and higher customized to meet the mission / intent of the ship.
swapable power and water generation plants
If you’re talking about the aluminum boats that cost the Navy twice what a modern frigate costs, be advised, they are not to be deployed to any waters featuring mid-level or worse intensity.
Check it out:
https://www.youtube.com/watch?v=wXw8bKzxocg
Jet powered catmarans for duty comparable to the old PT boats give width and stability for a fast ship able to go into shallow waters not suitable for deep draft monohulls.
Make them a stealthy design without flat surfaces and use some new stealth material to prevent radar discovery.