Interesting idea with Projector, mine is mounted upside down but on my "HillBilly" platform (I am on fixed income so I live on the cheap). I would like to do it over as if it gets bumped I need to reset the screen position which is a PITA.
Sorry but I am not the right guy to ask about your second point but post it ubder amps or vinyl and no doubt you should get a few ideas and one of them should be right.

