Drive across the parking lot to Hall of Fame Stadium, and you can’t stop looking up.

If you’ve been to softball’s field of dreams — and many in Oklahoma have — you know what it has long looked like from outside. Brownish-red brick and stone. Concrete entrances and concourses. Low slung exterior.

Things, though, have changed.

Now, there’s an upper deck, an addition of 4,000 seats and...