Happy new year folks...
Just stumbled upon this video and these AT-AT 3DS Max models are the best I have seen yet so I thought I would post them see if you can get your hands on it.
http://www.youtube.com/watch?v=8AothYl4evU
Perhaps helpful?
I also did a quick mock up of lukes crash on Hoth with a number of audio ideas but I don't have proper editing software so it is rough but where you hear the sound of AT-AT's firing you will have to imagine the lasers shooting at the snowspeeders and on the actual crash you will have to also imagine the footage reversing and slowing. Not going to bother doing a breakdown of what I did it's not that complicated but it does give the scene more continuity I think.
http://www.mediafire.com/watch/2i6oeogoe0pbkej/Luke%20Crash.mp4
Obviously the main problem is the distance the AT-AT jumps so I hope that can be or is fixed somehow.