Part 1

Make a new version of the aircraft carrier spawn that is a huge multi-block structure that combines into one structure (like IE machines) that can be driven around the ocean. It should have giant gun turrets with explosive shells, and places to place turrets and guns on the ship (to protect from enemy aircraft). There would also be different types of crew that spawn (mobs) like a captain, gunner, pilot, and miscellaneous other crew. It could also have a giant elevator that can move Flan's Mod aircraft and other vehicles up to the deck and down to the hangar. It would be 500 blocks long and 100 wide (yes it's huge). You could gain control of the carrier by defeating the crew, or completing a quest for the captain. If you completed a quest for the captain, the crew would become friendly, and would repair the carrier if damaged and maintain it. Before either completing a quest for the captain or killing the crew, they would all be neutral, and would only attack if you attack them first. If you complete a quest for the captain, the crew would also defend you and whoever else you want (there could be a list in the control deck of usernames to attack or protect). Pilots could fly planes (either Techguns planes or Flan's Mod planes). The ship would have mechanical parts (e.g the engine) that require power, and would spawn with a 5x5x5 nuclear reactor from Nuclearcraft (you could also replace the engine and mechanical parts with upgraded and different versions). This would have a giant HP pool of about 1000000 HP, as well as individual parts of the ship and mechanical components having their own health. You could repair different parts of the ship by using special tools, as well as things like metal plates and other components.

Part 2

Also add different types of other ships that would spawn with the aircraft carrier, like destroyers, cruisers, and subs. They would all have their own crews and weapons. (If you complete a quest for the captain of the aircraft carrier, then the crew from all of the fleet would become friendly. You could also drive around all of the other ships too.

Side note: I know that this a huge suggestion, and that this would take a long time, and may not even be feasible, but I think that this is a good idea, and that you should consider adding this to the mod.