more research...

The Catalonian Palace of Music, Barcelona (extension done by Oscar Tusquets)

RIBA Journal 2007 Nov v114 p54-68

St Edwards School (Oxford) Architect Haworth Tompkins. Contains a reconfigurable pneumatic floor (Nivoflex Airstage):

• small theatre, wanted to accomodate all kinds of performances
• the stage system is used across the whole floor (stage + audience space)
• floor can be raised and lowered on scissor legs up to a height of 1m
• each 2x1m panel is independent to give different configurations
• each panel cost 1000pounds.
• requirements - types of performances, stage set loads