Associated Press: Henry Ford’s great-grandson arrived at the shuttered auto plant to brag about a plan to revive the vast empty space: Investors would transform it into a modern factory to make solar panels and high-tech energy systems instead of Town Cars and Thunderbirds. “I can’t imagine a better way to reuse the facility,” Bill Ford said during his visit to the former Wixom Assembly plant in September. Several months later, a plan that exists only on paper is still awaiting final approval. …