For parking, there are 2 parking decks at Tech square and parking meters on 5th street at Tech square. I am not sure if you can park under Klaus building, you can have a look at www.parking.gatech.edu . Practice entrance at Fowler and Ferst.
There is closer visitor parking next to the Physics Building on Ferst. Also, the parking meters between the collesium and the softball stadium are free after 5, which is right next to the practice field. There are some more meters between the O'Keefe building and the frat houses that are also closer.