The all-new Cape50, the result of one man’s passion, will be launched in November in Australia, and the aggressive cruiser with a low profile, plumb bow, beautiful tumblehome and reverse transom is built to handle the often-rough seas Down Under. The Cape50 was conceived, designed and built by Steve Campbell and his company, Composites Construction, outside Melbourne. Campbell has been a master shipwright for the past 30 years; he’s sailed on America’s Cup boats, and he’s built racing sailboats. Since 2009, he’s also built 40 racing ski boats that top out at more than 100 mph. A few years ago…