why could you not bring the screen out say 6" from the wall, make a "sub wall" for the screen? your already going to spend a decent amount of time and money.. doing somthing like what i said wouldnt cost "that" much money not just for the brackets and what not, and the 6" you would lose, would that throw off your projectors throw? is that another issue? dont know if this helps, but it is what i would do in an ideal world.