Since we have different levels of airbases i wonder if it would work for Ports and V bases, as well as well as different type of ships. For Ports Maybe different types of fleets:
a carrier a few destroyers could be a Small Port's fleet
maybe like the fleets we have now could be Medium Port's fleet
2 carriers 7-8 destroyers a cruiser like the one here and maybe a battleship for a Large Port's Fleet
As for V bases maybe add 1-2 more VHs as they increase in size
this is a idea i came up with, but it is probably too late to add i am curious of what you guys think of my idea