The Navy is targeting an April start of construction for the first Constellation-class frigate but won't begin construction before the design is fully ready, Capt. Kevin Smith, the frigate program manager, said Tuesday. “We’re targeting that date,” Smith said at the Surface Navy Association’s annual symposium. “As I said, we’re coming through design, so there could be some risk to that. One thing we want to make sure is we don’t start building a ship where the design is not...