ORONO, Maine — Clara White stood proudly beside a gleaming cardboard creation Thursday evening, eager to answer a question that hadn’t really been addressed as she, her sisters and her neighbors built the shark-themed canoe. Will it float? “I hope so,” the Orono 10-year-old said with a smile. Only time would tell. “How many rolls of duct tape?” local paddler Kellen Doyle asked as he walked past, checking out the 11 boats local children had created. “About six,” Clara White said. Doyle nodded in appreciation.