Making a boat from a single 2x4 HD

This was my entry for Summers Woodworking Creative 2x4 Competition 2015 The rules said I can use a real 2x4, so my 2x4 was 5cm x10cm and 8 feet (240cm) long. The rules said also I can use 10 other material, this is the reason why I covered it with this ugly plastic bag and I used duck tape so I can remove the plastic bag easily after the contest. The design was really bad and I do not recommend it. I made no plan only a little model to get an idea what it should looks biggest mistake was to use a