i aint talkin bout no tech trees in galactic conquest with regular empire at war you would sometimes get a mission that would allow you to gain access to a pirate ship
mostly the frigate but you couldnt build it
and in a skirmish if you captured a space station you could build it
what needs to be decided is for what factions what ships get builded
and for what factions what ships can be earned
[warning raloks ideas ignore at all costs]
halo human faction
gunstars
sulaco
stargate human faction
ancient warship
andromeda
covenant
wraith hive ship
klingon bird of pray
like that
the bounty hunters guild is going to be confusing conseidering that there are bounty hunters in alot of sci fi universes