Thanks VA, I´ll really need those tutorials.
Now, with that technique you are saying that the turret´s base should move in it´s Y axis and the arms in their X axis? That would be opposite than the regular axis configuration.
At first, I was thinking of making the arms inside the blister pods within a kind of window, and something to act as the moving base that could barely be seen. And for the side turrets, just pods with windows that will be from where it will fire, these would be simple part turrets. The difficulty here, lays in not to break the calamari hull shape with conventional turret models.