You even could build an cloaked Dreadnought with an shipyard and the capability to lay mines/sats and to launch fighters.
With such an ship you could wander across enemy space and laying sats and mines wherever you like or leave some fighters in some nebula.
What the hell, you even could build some small ship in a nebula with cargo/troops or space marines to play pirate deep in enemy space....
Atrocities when is our new game starts
(I won the Last one
)