FILE - In this March 28, 2007 file photo, tourists walk on the glass-bottomed Skywalk that extends 70 feet over the edge of Grand Canyon West's Eagle Point, in Arizona. A Las Vegas developer must keep fighting in tribal court as he tries to retain his contractual rights to the Grand Canyon Skywalk, a federal judge ruled Monday, March 19, 2012. (AP Photo/The Arizona Republic, R..