The Olsen Bldg gets knocked down and a Performance Facility gets built in the parking lot between the Jacobsen Bldg and the Berg. Not sure what if anything goes where the Olsen Bldg was but they will have to put visitor dressing rooms somewhere. The NEZ lower level is rounded off and filled in with dirt but remains grass hilsides with a different slope. The concourse would extend over the entry of the Jacobsen Bldg where it merges with the current Olsen Bldg. JP has mentioned that you could "look down into" the Jacobsen Bldg from the concourse. I hope that the Jacobsen Bldg is tiered back matching the hillside thus creating some good sitelines in the corners. Put small stands in front of the Jacobsen Bldg for the band, above the 1st level suites (where the REG banners are) you build some suite type seating up to the second floor of the Jacobsen Bldg (similar to TTU's new endzone). Each team gets a true tunnel entry if that is done and also keeps access to the north exit remaining for utility and emergency vehicles. The SEZ balcony seats added 5,800 seats and since the angle is sharper in the NEZ, we could assume 300-500 fewer seats. Lets say 5,400 seats added in NEZ balcony. You would likely lose another 500 seats rounding off the NEZ hillsides so you really would only be adding 5,000 seats. If you added a new press tower (similar to the one at Arrowhead in KC would looks match well) you add another 500 seats. 5,400 new seats brings you to 66,900 and that is perfect for the next generation of Cyclones.
I would also consider moving the students to the NW corner so they could be closer to our players and not get in the path of the visiting squad when we storm the field but I like our students behind our players and near their exit so we can see celebrations.