So while I was playing the SotP Rebellion Alpha earlier, I came up with some ideas relating to starbases. I thought up my ideas under the assumption that a defensive station will be added to SotP sometime in the future.
Stations
Anchor Station
The Anchor Station is the Fleet support station and it would remain pretty much the same as it is in the Alpha.
Anchor Station Upgrades:
Hull Integrity (3 Levels)
AAA Helix Damage increase (2 Levels)
Hangar Capacity (3 Levels)
Deep Space Trade (2 Levels)
Construction Bays (1 Level)
Docking Booms (1 Level)
Self Destruct Procedure (1 Level)
Omega Station
The Omega (Gamma) station would be used to help defend gravity wells against hostile incursions, therefore, they have better defenses, armor and more hull points then their Anchor station counterparts.
Omega Station Upgrades:
Hull Integrity (3 Levels)
Hangar Capacity (1 Level)
Auxiliary Government (1 Level)
AAA Helix Damage increase (2 Levels)
Onager Defensive Batteries (2 Levels)
Missile Pods (2 Levels)
Mark II MAC (1 Level )
Self Destruct Procedure (1 Level)
Starbase Research:
Hephestus ACU Prototype
Allows for the construction of Hephestus ACU's and Anchor Stations. Also unlocks Omega Defensive Station Research.
Omega Defensive Station
Allows Omega Defensive Stations to be built.
Remote Construction
Allows Anchor Stations to build frigates and cruisers. Anchor Stations only.
Deep Space Trade
Allows Anchor Stations to act as trade ports. Anchor Stations only.
Auxiliary Government
A gravity well in which an Omega Station is built cannot be lost until the station is destroyed. Omega Stations only.
Onager Defensive Batteries
Onager Defensive Batteries are added to Omega Stations. Omega Stations only.
Missile Pods
Missile pods are added to Omega Stations (I'm unsure which missiles should be used). Omega Stations only.
Desperate Defense
A Mark II MAC is salvaged from severely damaged UNSC warships and is quickly attached to Omega stations to help them survive against the Covenant.
Self Destruct Procedure
Allows Anchor and Omega stations to overload their reactors and destroy themselves, to protect crucial navigational data against Covenant capture and as a last ditch effort to destroy enemy fleets.
Docking Booms
Allows Anchor stations to repair ships. Anchor stations only.
Unbreachable Hull
Increases the maximum amount of armor and hull points Anchor and Omega stations can have.
Advanced Fire Control
Allows Anchor and Omega stations to do more damage to enemy ships and engage multiple targets.
How I see station research being laid out: