Btw, some times the engine hull generation is not horrible.
It mostly depends on both engine version and your model.
Within persona (the mesh editor) you can access the generate collisions panel, set the limits of hull count and vert count, etc, click generate, and see what the engine comes up with via the automated (but manually controlled by you) system.
Personally, I generally do it manually, because after years i built my own pyton algorhitms to make them happen.
But, in a pinch the .27 generator works Ok.