I made this "floating sphere" turret recently, as a re-designed version of the original cannon turrets around my
Mysterious Science Station.
If you want a copy of it, download the station and blueprint the turret (see my businessman skills there?)
It was very loosely based on those wicked drones in the 2013 sci-fi movie "Oblivion":
I call it the "Oblivion turret", and its stats are:
Mass: 2K
Size: 41W, 31H, 33L
Weapon: 2x 2750/2750 cannon/cannon
Destructive capacity: 110,000 DPS (27,500/barrel)
Power consumption (when inactive): 37,000 e/s
Power consumption (when firing): 243,000 e/s