My players want a really huge ship, minimum cruiser, preferably Grand Cruiser or heavier! More firepower, more void shields, more space, more everything.
So I sat down and looked at smaller ships, and being a sucker for frigates in general, I decided to make a Sword-class frigate for a npc captain that could be a menace in the future. I like the design and it has turret rating 2, which is pretty awesome.
Strip out everything of commodity for the crew. We need space and power for other things. Stale air and pressed-crew quarters. Other components are pretty much normal stock.
Reliquary of Mars: Added an archeotech Logis Augur thingie that makes ballistics and detection easier.
A machine spirit that loves war and makes targeting better, but never backs down from a fight.
Add in Barracks. This ship needs soldiers.
Murder-Servitors. Splatter horror.
Command Bridge. +45 to hit and run and +25 to boarding :3
Drop Pods. Because we have barracks and it is cool to invade.
Add in 2 macro cannon batteries.
Retro-Thrusters for better manoeuverability.
In the end this ship is relatively fast, it is fairly easy to pilot, its also easy to shoot, board and hit & run with it. I can see it gliding under another ship on silent running, blasting with the dorsal cannons and sabotaging the opponent ship before they understand what is going on.
The problem with this ship is range. It can shoot outside of its range with the cannons, but ships with better range could be a potential problem. It also need to come close to another ship before utilizing its full potential: unleashing the soldiers and murder-servitors. Thankfully it is faster than most other ships, and could focus on dodgy flight until it get close enough to let slip the splatter robots.
I think this ship could cripple larger ships pretty fast. And think about it:
The explorers have found a fantastic treasure on some surface of a planet, shipping goods up to their ship. This frigate shows up, starting to sabotage the explorer's ship while launching drop pods down at the surface. Suddenly they have a war in space and on the ground.
The frigate lacks cargo hold, but as one of my players suggested when they were discussing their new huge ship: "why don't we spend all the space on guns and war, and have some little piggy bank transport floating around behind us?" So this frigate got a piggy bank transport full of slaves, thrones and other candy.