I am not working on this mod anymore, as life has gotten pretty busy. So don't expect new updates anytime soon.
That said, the dependecy only exists because I used the rocket turret prototype to create my capsule launcher turret. It was always intended as a "placeholder" and the dependency was meant to be removed as soon as I created my own design. However, after many attemps, I was never able to create anything that looked even remotely good.
If you really want to use this turret without Space Age, you’re welcome to create your own design for the turret. I’d be happy to add it to the mod. Alternatively, feel free to create your own fork and change the base turret yourself. I don't want to change the base turret in my mod, because that would mean changing its size, thus breaking people's saves. I'd be happy to assist if you need me to provide some guidance as to how to navigate my code.