Attached is an example of what I was talking about earlier. When you place one Galaxy(or any other Base Construction Component Vehicle), which in my drawing is shown in black on the bottom of the diamond formation, the game will then project lines and deployment guide markers (which are the red lines and squares) showing you where to deploy the other sections in order to link. The circle in the middle is where an engineer could erect a Portable Generator to complete it, or if they don't want to do it that way, you deploy a 5th base construction vehicle there, and voila, base becomes active, shield generator, spawning functions etc all become active, the ground inside the perimeter is replaced with metal instead of grass or whatever it was before, etc.