Alliance Space Stations were space stations used by the Rebel Alliance, they could be leveled up to Level 5.
Level 1[]
Level 1 Space Stations are small and weak stations, they only posses 1 Laser Cannon Battery, 1 Turbolaser Battery, 1 Concussion Missile Launcher, a Shield Generator, and a Hangar Bay. They could only garrison X-Wings and Y-Wings and were only able to withstand minor attacks.
Level 2[]
The Level 2 Station is a bit bigger, only an added turbolaser battery is added and a Proton torpedo launcher is mounted. These were a bit more durable and tougher though still vulnerable to attacks from Broadside Missile Cruisers and TIE Bombers. Were able to withstand typical attacks.
Level 3[]
These were even more durable and powerful than the Level 1 and 2 stations. They now had more weaponry and could summon Corellian Corvettes. While still vulnerable to Broadside Missile Cruisers and groups of TIE Bombers, they could withstand significant attacks and can be built on most planets.
Level 4[]
These mammoth stations are tougher than you could imagine, they can withstand almost any attack thrown at them and were a bit less vulnerable to Broadside Missile Cruiser attacks and small groups of TIE Bombers. These now are able to summon Nebulon-B Frigates and could hold their own against Imperial Star Destroyers. Now with more hard points than you would think, these will likely send back or take down just about any attack.
Level 5[]
Level 5's are as big as they get, although they take ages to build, they are certainly more powerful than any capital ship out there and will certainly show no mercy to whatever is thrown at them. These stations could build capital ships, if above Mon Calamari, Kuat, Sullust, Fondor, or Hypori. These could withstand major attacks from enemies and will likely stay standing if the enemy has no reinforcements brought with. These stations posses tons of weapons and hard points and a communications array. These will likely stay together on even the most major attacks, though very powerful, they aren't invincible.