I haven't come across any threads on Jack Murphy Stadium. I found some pics online. I think before they started expanding/enclosing it, it looked like a nice ballpark, especially for being a multipurpose stadium.
The first photo is a cool one of the construction. The second is during it's last expansion, almost completely enclosing it. One thing I find interesting in that photo is that they had the structure built but hadn't taken off the lights that extended out from the top of the scoreboard. Man that would have obstruced views in the upper deck.