What you're describing is essentially what the Jacksonville Jaguars and Miami Dolphins have done, no reason that it couldn't be done in an NHL arena. What they did was took out chunks of prime time seating, and made a little patio and bar area. In Miami they put in recliners and tvs. Now that's not really my style for in game atmosphere, but I was looking around Key Bank Center during the last leafs home game , to make one of these, you would need to remove an area about 10 seats wide, and 3 rows deep. I would prefer to see something like US Cellular, where your first row has a better experience sitting a little higher but right on top of the action, and rich folks who buy boxes can have the glass . Attached some photos of the jags and dolphions set up. The last picture is jax before the renovations.