TF5662 : Wouldn't want to clean those windowsNever mind cleaning the windows; you would be in big trouble if you broke one. The glass appears to be curved to correspond and marry up with the curvature of the turret. I don't know where in the world you would find glass of the right curvature and if you did, I would not like to imagine what you would pay for it. And as for the cost of installing it .....