Right, I'll PM you the model. I want you to start on Stand 1 - 3. You know how to add bones right? Coz the current model has no bones. It should be easy, and if you have troubles as to what bones you should make, tell me.
For Stand 1, leave it blank, I'll add particles to it in Magos. Just set its sequence to 1000.
For Stand 2, you'll need to assign a bone to the turret piece. Then the turret should stay still for half a second, turn 45 degrees right over 1/2 second, then turn 90 degrees to the left over 1 second, and then turn 45 degrees right again over 1/2 a sec.
Stand 3 - the turret (which you should've assigned to a bone already) faces 30 degrees upwards, stays facing up for half a second, and then returns, with the whole tank (which needs another bone) tilting to the right a miniscule amount, and the front-left tread tilting a bit higher.
If you need diagrams, I can make you some to give you a better understanding.
Send the model back once you're done.