by vardamir
BUILD action :Build ships / orbitals / star bases / monoliths.UPGRADE action : Take Ship parts.
Upgrade action gives you the chance to return any number of ship parts from your blue prints back to the stock. And then you can have up to 2 (or based on faction variable powers) parts from the general to the blue prints. In which of course you must have the available slots or requirement (technology, energy). In this matter, you cannot place drive into star bases, your ships cannot have no drive.