I asked that a while back and never got a straight answer from Alerus, UND, or the architects.
To my eye:
- to the north: no. The Aurora ballroom and kitchen spaces are there, as is truck access (trade shows) to the field.
- to the south: I don't know. Was the south wall designed to be moved should they ever need to horseshoe the facility? That said, those double-columns on each corner of the football field are structural. They hold the roof up. (Any engineer can see that.) If they could move the south wall they really could only go as wide as post to post or you'd have obstructed views.
My guess is if they could add a south end that they'd only be able to add permanent seating of about 40-50% of one current side. Think of south end as 50 yards wide and the west side is 100 yards. One side of The Al holds say 5500-6000 people (12000 total cap). You'd add maybe 2500-3000 permanent new seats in a "south end". I doubt they'd be able to name plate claim much more than 16000 in the place if they could add south end permanent seating.