Changing Flying Angle?

Hey guys I was just wondering if it was possible to simulate the changes in flying angle flying units get when they go over a steep hill or valley through triggers. Either when they turn to one side or when one end of the unit tips up or down, I just need one of these visuals to work. Any ideas?

Vex did the elevation for projectiles using a dummy model with different animations for different elevations, then attached the projectile to it. However, attatching a unit to the dummy model would look really bad, so you'd probably want to edit the unit's model's animations. Not sure if it would work (<- not a modeler).

Can't you change Art - Max Pitch/Roll and it will change the angle automatically? Or have I misunderstand the question?

You can change the flying angle, but this requires model edition.
Create a bone that links all model's vertices, call it bone_chest (don't forget to rename the exsisting one) then call the trigger that causes chest to turn.