Add a front cabover window - has anyone done it?

I would think that if a new rig comes without a window there, it may be that the structural support for it is not designed in. So if you take a jigsaw and cut the right size hole, the two sides may be too flimsy to accept the clamping effect of the screws. They got rid of the front window for good reason; between that, the overhead lights, and the seam joint on top, you have 3 ways to leak. What it would do to the value of a new rig might be scary.