Only one on a planet. I can understand that, from a “role-play/fiction” standpoint I suppose. But not being able to upgrade one is retarded. I trashed the layout I had, upgraded the command center, and reinstalled everything.
Extractors->Storage->Processing->Storage and once the first processing is done: Storage->Command Center for launch.
I have to look into the potential for stealing from the jettisoned command center cans …