I mentioned this in the discord, but I'd really like to see a faction the uses concave structuring, something we haven't seen a lot of in GC parts. I'm a big fan of the Armored Core series, and they take advantage of this style a lot. These aren't ships, but most mechs derive from turning a jet fighter into a humanoid so I figure they're similar enough.
To kind of show what I'm thinking, I added a couple images below.
Parts similar to the shoulders, torso, and legs of this mech could make for some really cool ship designs.
The lower leg on this mech uses concave structuring as well
A Thousand Wings from Destiny
Protoss Tempest from Starcraft