Oh that looks realy messed up.

Could it be that you ran out of graphic card RAM?
I had to put out another different tank before because it crashed the game. So i guess the map use all of the 256MB RAM of my graphic card.
What happened if you lower the game resolution or/and put the graphic settings to low?

I know that the map works because someone else from a different forum reported that he could play the mission without problems.