A District has a 'Large Clone Production Facility' Socketed into it's Large Socket. This Facility produces 100 Combat-viable Clones every 24 hours (5 Mature Clones an Hour). Now the surrounding Medium Sockets can be used to enhance the Main Facility. So you take one and build a 'Growth Hormone Plant' into one. This Structure can only be placed in a Medium Socket, and only if the Large Socket is a 'Large Clone Production Facility'. It increases the Clone output by 20%, making the District Produce 120 Clones per 24 hours.

The other Medium Socket is used to provide a Military Presence to protect the Clone Production. Socketed here is a 'Fort'. Moderate defences, with a supply cache of 300 Clones. And the ability to hold a moderate amount of Vehicles.
The last sockets are the 4 small sockets. Small socket Installations are key to setting up the frameork that allows multiple districts to work together, or enhancing the fucntions of the larger sockets. One small socket is built as a Small Clone Storage Facility. Allowing Clones produced to the routed there, then shipped in larger quanitities to other districts or off-world. Another is built as a Small Starport, capable of sending Clones to the Orbital Customs Office for collection.

The other two are earmarked to support the higher ups. One is built a Supplemental Clone Supply Cache, so the District's Combat Clone Supply is increased by 100. The other is a minor Clone Production enhancement, called a Growth Acceleration Station. Immature Clones are shipped here, and grown independant of the Large Facility. Increasing Output by 5%. (125 Clones every 24 hours from the District).

A Military District that has a Fortress at it's heart, has 1 linked Fort, and 1 linked Airfield. Each of those has one linked small Installation, a Security Outpost. In order to take the Fortress, you must take all lower linked facilties in turn.

As awesome as this would be, it's not going to happen.