Nope. Trust me; it can be done and it can be done in such a way where the turrets will fire. You just have to do it right.
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Ah yes, can being the appropriate word. Furthermore -as you have demonstrated- they can be done quite well and look very pretty.
However, my concern is that they are not optimal. The more mass a turret has, the more mass enchanters the main ship needs. Since these "turrets" need things like engines, full power, power storage, adequate shields and armor, they will be much heavier than a regular turret. Or, you must have a significantly smaller turret caliber. In the former case your main ship is weaker because you need more mass enchancers. In the later case your turret has a significantly smaller damage output.
Either way the cannons on the turret's base will not fire until it is undocked from the ship. Once it is undocked -iirc- the turret arm cannot "aim" and is useless deadweight on the drone. Meaning you have to choose between having an Unoptimized turret or an Unoptimized drone.
If you want drones (and why wouldn't you) make dedicated drones. If you want turrets make dedicated turrets. Having a hybrid sounds a lot like having a submersible attack helicopter.
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On a completely unrelated note have you released the blueprints for that last battle turret?