I would have the press box in conjunction with the bleachers, much like the 1A and 2A schools have. If I remember correctly when I was doing research for the costs of building a field, that you may even be able to purchase aluminum bleachers with a press box included.
Press box http://www.stadiumbleachers.com/products/press-boxes
Elevated Bleachers http://www.stadiumbleachers.com/products/alum-a-stand
I think there are two pretty reputable bleacher companies in Graham.
As far as locker room set up, I think hooks and wooden frames would be sufficient.
