I just saw the Spaceport picture and need to say, looks nice but wrong !

At DW1 spaceport's was only one allowed at a planet and i think you will keep that for DW2 too.
The unique part of a spaceport is the spacelift that connect to the planet. And this isn't reflected at the picture.
Not to speak that the central axis should point toward to planet to have a stable orbit.
IMO 3D is overrated, sure it is nice to see some model's at closeup. But honestly mosttime of your gameplay expierence you will see ships/station from the distance.
And when this 3D thing you want to have prevent the good shipdesign like we got at DW1 you maybe overthink that.
DW1 was real great with his shipdesign, that allow me to create battleships that are faster then destroyer, so i hight devote against "they also unlock particular hulls with somewhat different sizes and maximum component slot arrangements." and keep the freedom over components and hulls and the research just adjust the max. size like at DW1. Don't forget world destroyer are just shuttle's when you build ship with the size of gas giants !
The firing arc i read about is overrated too, it is space combat not naval combat.
At space the ship can fly with max. speed forward, while the front point backwards. Just switch a big weapon system to thruster.
So i think all weapons systems should stay at 360°topdown.
Except you want create a realtime battlesimulator, than the firing arc indeed would made sense, but not in a strategic game.
And i hope DW2 don't will be a Steam only release.