1>A modular cargo freighter taking inspiration from the Drake Caterpillar (Star Citizen) and the Zander Freighter (Microsoft Space Sim 1994)
2>A corvette class warship with working torpedoes (manually guided) and PDCs (manually controlled unless I can figure out the vizzy wizardry required to make auto turrets)
3>A realistic space warship based on the game "Children of a Dead Earth"
My vote: Number 1