With the touch of a button, a massive two-story-tall bay door opens slowly, as an insistent alarm sounds, to reveal part of the former Willow Run bomber plant near Ypsilanti, Michigan. A heavy waft of must and dampness rushes out from the dark interior. Once, scores of B-24 bombers exited these bay doors, on their way to aid the American war effort. "It works better than my garage door back home," says Grant Trigger with a grin, as the more than 60-year-old doors lift. Trigger is the Michigan Cleanup Manager for RACER Trust, which handles the vacant GM Willow Run Assembly Plant, along with scores of other properties abandoned by the automaker as part of its bankruptcy reorganization in 2009. The factory began its life as a Ford Motor Company World War II factory, famous for being the place where Rosie the Riveter worked. GM later bought the plant and converted it to make automobiles. But soon it will be demolished, unless a modest museum can raise more than $4.5 million in the next 15 days.