Camera Movement

I have now begun the filming of my animation using a simple free camera to begin with. I have been careful to make sure that the positioning of the camera does not give away the illusion of the scene (by filming the top of the background images, for example) and before the objects are going to begin moving, I have started by using a sweeping camera movement to set the scene.
The camera is being viewed in the top left-hand view, so that it can be seen what the scene looks like through the camera lens. I have started off with a high angled shot, which sweeps down to a long, straight-on shot by frame 150, then zooms in slightly on the next 20 or so frames, which is when the relevant movemnt will begin.
As I currently have a good visual in my mind of how the cameras are going to work (I thought it out quite thoroughly in my mind during the pre-production stage, mainly when the storyboard was being created), but if I find that it is needed later on, I will write or draw what camera angles and movements need to be used to give the effects that I want for the scene.
When I begin to animate the tank, to get more of an idea of how the tank moves usually, I have been watching videos on youtube to try and see which parts move how, so that when the tank spirals out of control later on I can make it as historically accurate as possible. One useful one that I have found today is from Assassins Creed Brotherhood:

http://www.youtube.com/watch?v=Txb6haeNvgc

It helps that I have played the game, but with never really analysing how the tank moves, I can now look at videos to remind myself. To animate this, I have been grouping and ungrouping sections of the tank so that when it needs to be animated, if certain parts just need to be adjusted, it can easily be done using this tool.

With the tank, I have been using isolation mode for editing certain parts. With the door starting off open and then needing to be closed, it begins as being a seperate group to the tank, then after the animating of the door, will be grouped back together with the rest of the tank. The metal parts of the door that are holding it open are the same: they are a seperate part until they retreat back into the interior of the tank, which is when they become part of the big group again. So far, the tank is spinning slowly, then, as the camera reaches it, the tank's door begins to close. The tank stops spinning and the door is completely closed.