Turning a Concert Hall into an Opera House. For the Production of ‘Carmen’. Our Concert Hall is located in the Music Building and has 270 fixed seating. This pictures captures the stage flooring ideal for most musical ensembles. Not suited for an Opera. The opera Carmen, with Orchestra Pit. Building the stage. This stage was rented and was 12ft x 24ft, with a height of 5ft. Concert Hall transformed. Let’s add some lights… Ramp and stairs are being prepared to connect to the stage.