There is seemingly only one obstacle remaining between Michael Davis and his Wainscott Wombles development on the corner of Montauk Highway and Sayre’s Path, but that last obstacle may be impassable, at least according to David Eagan, an attorney for the Concerned Citizens of Wainscott and a neighbor, who is challenging the right of Mr. Davis to proceed with his plans to tear down the building there and construct a similarly-sized one with a garage, small house, and parking spaces behind it.