Nice tutorial, the issue i had like lots of people was with the camera sensitivity: while freelook sens. seems to "derive" from the sensitivity, i don't think that's the case for the zoomed camera sens. (at least when you're in "freelook" mode)
I also had a hard time going up some slopes with the tank, and it shaked around a bit when i moved on one of those
otherwise, it was fun to play, especially with the biggest cannon