Right now a destroyed Star Fortress/Battlestation will immediately return to its full strength once its rebuild period has passed. It'd be more interesting if they rebuilt one section at a time, progressing from Orbital Station > Battlestation > Star Fortress over a given period, giving hostile factions/the player to kick it back down while in a somewhat weakened, but combat-capable state.
This could go even further with CR and damage to hull/armour of each component being tracked for each station, ie the station is repaired and recovered from 10% hull/armour/CR once it becomes operational again - obviously the time in which it's completely out of action would then have to be shortened.
