Bully SE itself just doesn't have the proper physics system to execute such a thing. Sure you can probably flip Jimmy in a bunch of random directions, but you can't have his body parts just swing around like they do in GTA IV/V, or even like Skate 3. As of right now, and as far as I know, there is very little to none; information known about Bully's physics system. IF it even has one, it is a very basic one. DaBoss created one for GTA IV, and there is a slight chance a different physics system could be ported to Bully, then again, it's always possible it wont be compatible. The least that can be done at the moment with proper knowledge is just re-creating the Act.img, and adding custom animations. Still then, the physics would be much like Mafia II's physics, with no ragdoll.