Krowanek Nice ship! Fighting this with something slower must be really hard...
I see some room for improvement however:
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Use 1*2 armor for the hull, it's got higher penetration resistance.
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Replace those connecting corridors with structure. It may look worse, but only costs half as much.
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Add a second railgun, your current power system can already supply two anyways.
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Remove some unnecessary corridors (like the ones in the inner flak module).
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One factory can't even supply a single flak turret, so having it supply two is a rather bad idea.
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Remove some of the frontal amor, your never gonna need that much.
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You missile modules could have two shields.
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Check for those little mistakes everyone makes once in a while. (The second shields in front of the railgun lack armor on the inner side, the door placement could be improved on some spots, ....)