I installed this mod and loaded my current save, when suddenly all my platforms started screaming bloody murder. oops hehe. most of them didn't make it.
pours one out
Anyways, would it be possible to have an option to keep the original rocket turrets as well?

Just rolled out the version 1.1.3 which have a compatibility mode setting which is turned on by default. This prevent the complete removal of the SA Rocket Turret from game. Existing entities and items remain the game world. However they cannot be crafted or researched anymore.

So it is not intended to be a justification for keeping the SA Rocket Turret as an alternative. It is a way to have a smoother transition period :)