Thanks to Achronos11 for providing me with the necessary Editor and Form ID.
I have updated the decapitated mesh and it should more faithfully recreate his original idea.
As clearly seen, the decapitated mesh is now placed higher in order to prevent the player from clipping through it.
It has no collision data, and I could not transfer it without causing crashes to the GECK.
I will do more research on collisions and implement it in future updates.
Since the original request from the Nexus forums is now available, I will take a look at some other requests.
Raider's Brutality will be updated with more features over time. Stay tuned!