Oh, that is just awesome - I hadn't seen a product like that before.
To answer questions:
I don't have a projector yet. Between my funds and the PTO we'll buy a nice one, but the type and
lens are dependent upon placement. Short term we have a few around the school that are 'workable.' As for use, right now it's mostly presentations and videos to meetings. As a director I'm not big on video in shows. Cost at the moment is not as big of a concern as placement - and yep, I know how pricey these get.
Source is a problem - I'll either run a few miles of cable around the space, or experiment with wireless video systems. Yes, yes, I know, try wired if I can.
Probably run a computer or DVD player at midhouse position, since the curtain obstructs the use of my booth.
I have a motorized rigging system, which is much more stable than a traditional counterweight, but still...a slight movement is going to translate to several inches on the screen. Distance to the screen from the current floor mount projector is about 15 feet, which places the rigging on my last scenery
batten.