Back to the SEZ, I will reiterate that any improvement is awesome. The Horseshoe isn't an inherent problem because it's old ... East Main is old. It's a problem because it adds nothing to the stadium and even actively hurts the stadium. It's too far from the field, it packs the maximum number of fans into the smallest area possible (the opposite of what modern stadiums do), it slopes back too gradually to add the necessary height to make the stadium look complete and its architecture (specifically the exterior) is jarringly out of place compared to the beauty of the rest of the stadium. So, even just bringing the stands down to field level and touching up the back would be a HUGE improvement. With that in mind, I see the SEZ plans in these tiers.
Tier 1 - Bare Minimum ... If literally nothing else is done, we need to fill in the odd gap behind the end zone by bringing the first row down to grass level (similarly to the sections on either side of the Horseshoe) and add some rows behind the current last row to create some height. We haven't had a track in decades, so the front fix should have been done with temporary bleachers yesterday! Ideally, both of these are permanent seats that also touch up that area massively, internal and external. This is the fix if it is determined that we don't want to mess with removing more than we have to of the existing Horseshoe structure and can't get things to work behind the SEZ with the street or something.
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Tier 2 - Add in Some Suites ... This is the LSU example I posted the other day. You fix the current issues with the Horseshoe without tearing up the whole structure, and you add in revenue-generating suites on top (probably for a much lower cost than more transformative options) to help pay for it.
Tier 3 - Iowa Prototype ... The Iowa NEZ transformation is very popular here, and for good reason. They managed to build a nice new structure that is as close to the field as possible, creates an impressive amount of height, closes in the corners to trap noise and includes luxury suite areas to generate revenue but that actually seamlessly fit into the overall look and it distributes capacity in a really efficient way. I've said this before, but it is truly astonishing to me that the structure below has the SAME CAPACITY as our current Horseshoe, even though it looks much grander!
Tier 4 - Home Run ... This is the dream if money really isn't short in any way. You build a "wall" of fans that helps close in the stadium, make the atmosphere more intimidating and help to trap noise. You also add in those revenue-generating suites on top to help get a return on this, and the exterior (either one of the options below would be great, but I actually like the one with the columns a lot more, personally) can honor the architecture of our classic stadium. I actually think this option is even better than Iowa's, as it tries to honor our traditional look. The ONLY thing I would change if I could is taking out the walkway in the middle three sections only to create that intimidating "wall of fans."