The lens needs to be more or less in line with the top of the screen, so can you not use an adjustable mount to clear the beam?
Something like this:
Amazon probably have a good range, or any specialist PJ place will have them.
You can check out the throw distances and screen sizes etc with this calculator:
Basically, the throw distance is the throw ratio multiplied by the width of the screen. The throw ratio for the w1070 is 1.15-1.50. So, for example, if your screen is 90 inches wide, then the acceptable throw distances are from (1.15 x 90) 103.5 inches/8.6 feet to (1.50 x 90) 135 inches/11.25 feet.
Thanks really appreciate this!! Using that calculator I it seems I can just get within the 'green' for the screen size that I want and throw distance without even having to play around with the zoom very much. I've found a few mounts, but they were a lot more expensive than that one. I found a $30 one on monoprice as well...but not sure if I really want to go that cheap. I'll do some more looking on that end.
For the lens shift, I was reading that the projector (as do most) will naturally project the image lower than the lens is sitting. Is it possible to use the lens shift to move the image back up my wall to the height of the center of the lens? This is my main concern because if it cannot do that I'm substantially cutting the height of my screen which reduces the screen size that I can use which may throw me out of the ranges that are even compatible.
IIRC, the lens shift only allows for a downwards variation from 'neutral'. Even so, the lens shift on the w1070 is very small so I wouldn't rely on it helping you much no matter what. Like I said, the PJ projects the image in such a way that the centre of the lens is more or less lined up with the top edge of the screen. If you use an extending mount to bring the lens just below the beam, the top edge of the screen will be just under the height of the bottom edge of the beam, from the floor. If you measure that height, that will roughly be the height of the screen you can use - the calculator will show you the width of the screen for whatever that height dimension is. If you go ahead and get the PJ, I would put it roughly in position (on a stepladder or something) and project onto the wall so you can see exactly what screen size you can use - then buy the screen afterwards. The PJ has a test pattern you can throw which will simulate the screen size on the wall for you.