Overall I like the expansion and think it's a great addition even though it's still in beta.

However I did notice a couple things.

The second upgrade for the Docking Booms on the Argonev Class Starbases has zero range. The first upgrade appear to work fine. This happened on all the starbases I tried to upgrade it.

A couple of suggestions if they haven't been made already. Add construction queues for the starbases once they themselves have been queued for construction. The second one is being able to queue the fighters once the hangers have been selected for upgrade.