Great Site! The wall in which the screen will be placed is 8ft high and vaults inward to a height of 10 feet. The projector will be ceiling mounted 11-12 feet away from the screen. I'm looking at the Sanyo Z1/2 to project a 100" diagnal screen. I'm not sure how far down the screen should be from the beginning of the vault. Does the manual lens adjustment allow the projector to be slightly higher than the screen without using keystone adjustments? I'm concerned how far the projector will be hanging down in the room. Thanks