Its also ridiculously expensive and I'm guessing fairly tempermental. Lifting a 3ft thick 17000 sqft slab of concrete (which my back of the napkin calcs is about 3000 tons) is no small feat.Did I see that right? The floor raises up and down?
The ability to raise and lower the floor would make a huge difference in many of these setups. Lower it to allow the seats to pull closer to the basketball court and raise up to fit in the ice for hockey.