I never said the 60km is movable. In my story the 60km ship is more like a stationary background object that is mostly inactive and will be featured mostly in rendered cinematics. Unfortunately to explain it better I will elaborate on one of the last missions I have planned. My 60km ship (the Guardian) is far in the background with a huge fleet of ships between the Meteor and the Guardian. The Meteor is attempting to reach the Guardian and use it's main cannon to devestate a continent on a nearby planet. The Guardian, in a cinematic, was disabled and left drifting in the orbit of the planet. So anything larger than the Battleship class (7-20km) is going to be a stationary decoration to the map.
My story is quite cinematic in style so unfortunately you WILL become a spectator on the more breath taking moments (though you can still fight during the scenes) but I'll try to keep the gameplay moving and not distract the player.
About the Battleships (Meteor and Inecitoruas), there are very few of them like I said before: 1 Meteor and 4 Inecitoruas'. It is rare to even see one of them at all.
Indeed, the textures will be a big problem. Either I 1) Make some seriously detailed and large skins 2) Be very creative with the tile textures or 3) Simply keep the object far away enough that you can't see the blurrs.
And those bays arent just for fighters. My friend said that those are frigate bays (which I feel is unusual but interesting). My Meteor has something similar in that there is one large opening but it is closed. There are 4 other, smaller, bays mounted in the two large... wing things on the inside edge facing each other.
About turrets, the real problem on the Inecitor' is that my friend described it as being lined with numerous beam points. My Meteor will feature much less turrets that the other but considering its huge size and armor a fighter really can't kill it alone. Then again, a torpedo will do the job well but it will have to get inside first

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Ah, the post is getting too long. All I can say now is that you have plenty of points and thanks for pointing that out. It makes some things easier now. Just remember everyone, my story is UNIQUE. It is NOT based on FS at ALL. It is a completely different universe that me and a friend worked on. Btw, I like that quote. And everything can be blown up, just not by you.
And your right about the repetitiveness so I'll think of a way to get past that.