From a design perspective, I would think the real challenge is whether they can put many seats on the East side, because the water’s edge looks really close. Looks like they could have more seats on the North, West and South sides, though. Concession and restroom facilities have to go somewhere, too. Locker room space might be in the Ryan Fieldhouse or Walker Athletics Center, which are just to the northwest of where Martin field is.
As I recall, the visiting locker rooms at the old Ryan Field were rather dismal, ranked worst in the Big Ten. Almost anything might be an improvement. (But at least they weren’t painted pink.)