[Van]

Wellll, depending on the theatre, and how much room you have < does the thirty foot rule apply ?> you can manufacture a nice set of french doors out of a single peice of 3/4 CD plywood. Lay in the panes in whatever layout you want, attach a piece of 1/8" acrylic or plexiglass on the back and viola' Les porte francias. The side lights are the same idea but just build a door flat with a 4' openeing for the door and at least 6" on echa side of the door for the side light openings. Rather than trying to "build" the side lights, just cut the openings into the luan facing and apply moulding to make the mulions. You can also take a router to the "mullions" of the door itself to give it more detail. If the ply has a lot of voids just use drywall mud to fill the voids and paint to your desired look. If you need more details let me know I could draw you something real quick.
this is just one idea you could also do stuff with steel or actually build a "real" french door realtivly easily, as they are pretty simple.