For a few hours one recent Saturday, Jack Beyer stood on the roof of his Land Rover, watching as SpaceX employees toiled under a 160-foot-tall silver rocket prototype that towered like an otherworldly visitor over the otherwise barren landscape.For a few hours one recent Saturday, Jack Beyer stood on the roof of his Land Rover, watching as SpaceX employees toiled under a 160-foot-tall silver rocket prototype that towered like an otherworldly visitor over the otherwise barren landscape.