The second game, a top-down driving game, could really use more features with the current 3D Box.
I'm not sure if it's already possible (as I haven't really looked into this in any depth yet), but would it be possible to have different lengths, widths and heights selectable with the 3D Box?
Also, but not as important, would it be possible to set the height at which the 3D Box sits in the scene
I'm not sure what you mean by this - you can resize the 3D box normally to change the width and height... have you looked at the Z and depth properties as well?