The western stand was built in 1994, it's pretty ordinary in the concourse areas at the top and bottom. I'm not a fire expert but I'm surprised the lower area meets code as it is extremely tight and cramped when you're trying to get out after a game, I can only imagine the crush that would occur in an actual emergency on that side.
Suncorp doesn't need a knock down and i don't think you can expand it due to the roof support pillars and the way they're built, you could maybe rebuild the older western side and make it a bit bigger with modern design, the roof line would probably have to be changed on that side which would ruin the continuing line the whole way around.