Sweet project, so are these vinyl stickers being printed by a print shop from your own image files, or you purchasing pre-made one online somewhere then cutting them to size??
A good idea I'm just thinking of, for the interior panels right next to the screen, would be to buy this black felt-like material used in home-theater applications, which absorbs light reflection (don't know the proper name for the stuff).... seems like it would be bothersome if left bare painted or a covered by a shiny vinyl sticker.