MIAMI — More than 40 migrants from Cuba arrived in the Florida Keys and Key Biscayne aboard three separate boats Friday, according to the U.S. Border Patrol. Two of the vessels in the Keys were about 20 feet long and displayed what a veteran Florida Fish and Wildlife Conservation Commission officer called “ingenuity and desperation.” One of them, which was still floating about a mile offshore of the Upper Keys community of Tavernier Friday afternoon, had a hull made from welded together 50-gallon fuel drums and highway guard rails. It was powered by a Russian-built diesel engine. A plastic sod…