Yankee Air Museum board chairman Ray Hunter signed papers Thursday making the aviation museum the owner of a 144,000-square-foot slice of the former Willow Run Bomber Plant, where Rose Will Monroe and other workers built B-24 Liberator bombers during World War II. The signing ceremony represented the culmination of efforts to raise the $8 million needed to save part of the factory for the nearby Yankee Air Museum's new home. Hunter, Montgomery and others associated with the Save the Willow Run Bomber Plant campaign want to convert the factory and dedicate it to aviation and all the Rosies who toiled at similar U.S.