XPiratez feels so fine Yarr, no need for improved gfx, Capn'! 😎 that I've been playfully pondered creating concepts to an enormous feature addition: WASTELAND STRONGHOLDS, because it would be fun to own small pirate forts for a start, maybe just to see them being annihilated by some nasty creatures.
Same feature could enable an option to take control of some special mission areas afterwards and have their establishments as researchable booty or to manufacture stuff or train hands or whatever. Or maybe I should just make a comic out of this.
Vaults and tunnels would still be the best for the underground pirates' main campaign, besides being the mod's core idea, they are hard to spot and actual shelters. When playing on higher difficulties, it would be impossible to protect any noteworthy fort without smart power strategies and pricey hi-tech defence systems. However, some systems should always be simpler and more economically wise to be ground-based.