Irwin Jacobs, the bilionaire owner of Genmar (which is the world's largest privately owned boat company), gave his key to succes:
"Fill a need."
Is there a great need for another line of large racing/pleasure catamarans? No.
That said, follow your dream. But do it with your eyes wide open. As someone else pointed out, your proposed cat line will be up against Skater and MTI. You'll be fighting for market share top-flight "newcomers" like Mystic and Doug Wright.
Your customer base, though well-to-do, is tiny.
Is your goal to get rich? If so, find another business. (And fill a need). Is your goal to create an amazing catamaran. If so, follow your dream knowing that it might not make you rich, that it might well go the other way, but that you are doing what you love.