Tim, wheelchairs are downstairs, but you can get in first before the sardine packing begins. Go pee before the show. Last show we were there a wheelchair next to us took about 15 minutes to plow through the 'idol' struck crowd. Smoking is upstairs on the balcony, dunno if there is an elevator?
My fav spot is downstairs behind the first wall in the middle. There's ramps to get there, enter the hall on the right aisle.
Rich