(too long for a comment)

So far my favorite Starbase mod, thank you!

Two suggestions from my side:
1) "As starbases cost a lot to upgrade, I wouldn't like them see destroyed. What I would certainly prefer is that when they are conquered by an enemy their firepower is disabled until the current owner repairs them for X amount of ressources which also takes some time. So even if an enemy conquers your build up starbase it's not an easy short term benefit and to use it for himself, he needs to invest time and ressources. During this time, you have a timeframe to re-conquer it without having to fight the guns you built yourself, while the enemy got them basically for free." (copied from my post on the stellaris forum)
In this context, the mechanic from "At War: Defense Platform Longevity" would be dope as well :D

2) Imho it would be convenient if outposts were visible / clickable on galaxy map and have one building slot available, in case you have a colony in the system and want to build a transit hub, but don't want to upgrade your outpost.