How to Build a Room Divider for Large Doorways : Home Improvement : DIY Network. I would simply attach the casters to the bottom of the doors and perhaps hing them together so they create a solid wall.
Old doors as room divider,why not? Maybe between kitchen and either dining area or living room.does not divide the whole room.but makes a good separation.and I do love the Old Door! (For closet area in master bedroom)