So here's my idea for any modders willing to take it on. I assume that, as carbon based life forms, everyone here has seen "Fury Road" at least twice. In the film there were three main factions of bad guys who were all working together. With their methods as a basis I realized that they could easily translate into a sci-fi, or more specifically Star Sector factions. I'll go into more detail thus...
1) Three factions, one planet each, all based in the same solar system.
2) The first one, based off the Citadel, specializes in producing food, marines and crew. Their ships tend to be based on 360 coverage with their weapons and high speed, but are otherwise fairly normal. Heavy emphasis on missiles (because dynamite spears) and all their captains have their AI fixed to "reckless" behavior - as dying in glorious battle is the goal in life of all their crews. Because of this they are also the absolute least likely to retreat, ever.
3) The second faction, based off Gas Town, specializes in producing fuel, hulls, tankers and salvage ships. Ship emphasis tends to gravitate towards capital ships and frigates - their middle size range is somewhat lacking because of this. All, however, will have layouts putting emphasis on close-range brawling (because pole-cats). In contrast, however, they have the strongest survival sense, with their captain AI set to "cautious." This will lead towards them dancing around their targets until they see a weakness, then lunging in for a quick strike and then exiting again (again, because pole-cats).
4) The third faction, based off the Bullet Farm, specialized in producing supplies and weapons. Lots and lots of weapons, mostly ballistic and with very high ROF (if not accuracy). Slow, medium size and very heavy armor is the order of the day, with their captains set on "aggressive" to show that they're not afraid to tough it our or even armor tank when needed. Despite the ballistic emphasis, weapons should be the longest ranged of the trio, enabling them to engage opponents from any distance. Distinct lack of missiles, however, as their idea of a "finisher" is simply "more dakka."
All three would start off more or less allied with each other, with strong diplomatic ratings and even an outright triple-alliance if using Nexerelin. Though no one planet is truly capable of surviving independently, via trade the tree all manage to support each other and make their small group actually effective. I must note here that this would make a wonderful change of pace than the over-saturation of "uber factions" out there who all have single planets with more industrial power than the Galactic Empire. Instead, here, we see industrial power as it was meant to be in Star Sector - through allied trade of specialist planets who are providing to each other.
Finally, if one wanted to throw in some pirates based off the Buzzards and Rock Riders, well, that can also be done...
5) Buzzard designs would, naturally, be spike covered and do extra damage on collisions. Weak or no shields but good armor, and very aggressive in battle with booster hullmods to increase their ramming ability. Tend towards the small side, however, with only one strong capital ship that doubles as salvage and transport.
6) Rock Riders would translate into the smallest, fastest pirates you've ever seen. Their frigates would be cheap, numerous, flimsy but so fast they make phase ships look slow in comparison. In fact their ships would essentially be little more than glorified heavy fighter craft, but coded as frigates so they could operate on their own. Reckless pilots with front and side mounted short range, rapid fire ballistics (all point defense types), no rear guns because they can probably outrun missiles and incoming fire coming from behind. We're talking speed in the 200+ range, but also probably less than 1000HP total for any ship, including the armor.