I'm wrapping up my current Nexerelin playthrough as Mayorate with a bunch of other faction mods. I used a Mayorate Del Azarchel as my flagship for a long time, then switched to a Victory battleship (DR's Ship and Weapon Pack), and finally a Mayorate Ravana. While I was using the Del Azarchel I was attacking the last pirate station in the sector. After stomping their defense fleet, I captured this hidden gem: a pirate Stalker cruiser (Underworld). I normally don't care for pirate ships unless it's earlygame and I need every ship I can get, but I decided to mess with this one a bit and was surprised with the results.
Max OPs from tech/weapon skills
heavy autocannon
4 light assault guns, autofire and alternating
hailfire chainguns for PD
large ballista rack
It has nice range thanks to the ballistas, targeting unit, and sensor drones. I got it so late in the game that I didn't really get to use it much and mostly piloted my battleships, so I may play pirate in my next game and cheat myself a Stalker with similar loadout but no hull mods to start the game with. (edit: Nexerelin lets you choose a Stalker with a Buffalo(D) and Venom as one of the starting setups)
I also messed with the Omnifactory a bit. I normally don't use it but this time I replicated a regular Wolf, Wolf(D), and Diable Vapor. The Vapor was the real star here. I set up a loadout with max caps/vents and two plasma flamers. For hull mods I used Safety Overrides, Unstable Injector, Expanded Magazines, and Insulated Engine Assembly. The result was a stupidly fast pursuit ship: not great for a serious fight but fun to fly when chasing convoys or mopping up defeated fleets. I kept two Vapors as well as three regular Wolves and three D-grade Wolves with Unstable Injectors and random weapons to deploy from the left and right.