One of the things people often forget is that in Sins, you're often dealing with thousands upon thousands of ships. That's why you won't see things like moving turrets. If this were a game with only a few dozen units that sort of thing makes sense. But the biggest appeal of Sins, IMO, is the scale of it.
I'm sorry to take the nay-sayers seat again, but I'm a little tired of this argument.
Why are you people giving ships such omgwhatthehellhowawesomeisthat!! graphics if you focus on the scale? When there are "thousands upon thousands" of ships, nobody is going to see a single percent of the graphical oomph you're throwing into this game anyway.
Let's face it, some of us (many of us I suppose), sometimes ENJOY closing up on the damn ships and seeing how they pew-pew stuff. The full extent of the graphical awesomeness is only visible up close, so you definitely expected people to do that sometimes.
On the other hand, the game already has methods to limit the amount of graphics depending on the distance. For example, when you zoom out far enough, the ship becomes a 2d icon.
Tell me please, in full honesty: Is it REALLY IMPOSSIBLE to add moving turrets, for example if you zoom very, very close?
I really don't care if my Garda frig has moving turrets when it's just a little dot on the screen or a 2d icon, so the turret may (should) not even be rendered then. Only when I'm really up close should they become visible.
Hell, the immobile turrets that are now can even be removed completely from unit models and replaced with meshes/particle effects/whatever it's called, which are only rendered when the player is looking at the ship from a very small distance. Like rendering a piece of debris that is only visible at a very close range and that just happens to look like a turret facing in the proper direction.
TLDR: In short, I do not believe that it's not doable. I think it can be done. It's just that Ironclad CBA to do it. And you know what? It's okay. I can really believe that you do not have enough funds, time or men to do it. It's really okay.
Just please stop hiding behind "it can't be done" or "it's nonsense due to <reasons>", because many players would really REALLY enjoy seeing that their ships are not flying lego bricks. That's how they look now when you zoom in, flying bricks. Nicely detailed flying bricks.
All you have to do is say "sorry guys, moving turrets won't happen because we don't have time to remake all models for them; it would require way more work than it's worth and there are a hundred other things we should spend our time on, balance and bug-fixing among them". That's a bloody good argument right there and we will take it. Just be honest.