as far as i know, theres nothing to change about the torn model. i also had this, when modifying the crew models in sh3. asked several people and posted a thread. but no one could help...
its about the single model positions, which are needed to have a functional animation, i think. its built of several single states, which are lined up. but in detail i do not know, how it works. maybe sh3 engine does also something to the animation, which leads to the destroyed model...?!
sorry!