Based on this, I would recommend my second suggestion for the drop down projection. Have you already purchased a screen or have you been renting? Have you ever seen the rigid frame screen that they use over at Gammage (4:3 format)? They use it for the Warren Miller ski films. If you have the flexibility to give up a lineset for something like this to live on, you'd probably be happy (especially if it is just downstage of a full stage masking with a teaser just downstage of that (to mask the rigging). Since you are doing front projection, be aware that you will have to control light (even bounce from the stage) so a lower light angle is preferable (for you, not the speaker).
Since you will be having it professionally installed, they should be able to run Cat-5 cable for you as well. With the use of baluns, you will be able to get better signal reliability than wireless (and considerably cheaper than fiber-optics). If you are unfamiliar with this technology, check with some of the local AV companies (LMG or AV Concepts - both rental companies - carry this type of gear). The cabling would be able to drop from the cats to your
FOH position when you have the drape in and could probably go to your booth when it isn't.