Hey Eddy,
your tween looks like a rotating cube? I think you should work more with the 3. dimension of Watchout. You can set the anchor position in the Media Cue in the z - way to the half of the image resolution. Rotating now arround the y-axis will automatic generate the three-dimensional look...
Another idea is to use the corner tweens. (would be a lot of programming work...:-))
Best wishes!