This should be allowed to be able to keep your bases defenses up with the rapid changing fleets. Defense platforms should be able to be changed upgraded just as easy as fleets can be refitted. So please consider this. This has always been one of the things that turns me off about this game. I know technically they are buildings but they should not be counted as such.
Thanks
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I still have some L9s, just doing OP-12 atm, then dock, THEN I'll finish the turrets.
It's honestly not as bad as you think--& as another said, you can use base parts (to L9 turrets)