A circa-1969 diagram showing the twin-projector presentation of an UltraVision Theatre. As previously stated, the auditorium in an UltraVision venue was oval-shaped.
Drawing from the Ocala Star Banner

Knoxville, Tennessee's WestTown UltraVision Theatre. A peripheral structure of WEST TOWN MALL, it opened for business in December 1972.
Photo from http://cinematreasures.org / Raymond 

Asheville, North Carolina's ABC Mall Twin, a duplex UltraVision venue, was added to ASHEVILLE MALL. The freestanding movie house showed its first features in July 1975.
Drawing from http://cinematreasures.org / "Rivest266"