Before the SEZ I ran a design across JP's desk which not only would have accommodated all the luxury boxes we could ask for, but would have put ISU as one of the most unique stadiums in the nation. It was designed to house donors on those cold late season games, yet always give the impression the stadium was at max capacity by wrapping the skyboxes into the deep corners. It utilized transparent OLED technology to make the aggregate of endzone skybox windows a large screen on the field side. BUT, I was too late. The SEZ plans were too far along.
As it stands, 'today' I'd postulate this approach. Remove the top two floors of the existing press box and cantilever from the existing pylons out with composite materials. You should be able to go out the same distance on both sides, making it 3 times wider. Mirroring that on the other side in the future would then be less expensive and less impactful to the existing structure.
If there's one thing I was always accused of as an Architecture student it was my 'wow' factor. And boy, did I have some doozies. Can't help it.