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Thank you for this article, I loved it. I am thinking about doing this in my office. For years I have been hanging a sheet in my living room window and projecting images onto it for Halloween. The lower window panes have a frosted film on them for privacy, and I have noticed that they look pretty decent with the projector. Have you ever tested a piece of Plexiglas as a screen with a frosted window film on the back side? It would be a bit unwieldy for a 120" screen, but for someone like me, looking to make a cheap 60"-70" screen could it be an option? It would be movable, which would be a big bonus in my office.