I laid this out, and I have a question. Does the keystoning work the same in a vertical as it does in a straight design.? Thats the way i see it. What I mean is if you tilt up a straight design to hit the screen, then the fresnel top is further from the lcd which is actually the bottom of the picture. So then in a vertical, the forward edge of the screen which is also the bottom of the picture would need to be further from the screen as well to make the same correction. Correct ?