How do I make a boat for a middle school boat regatta?

How do I make a boat for a middle school boat regatta? We can only use 1 roll of duct tape, as much Elmer's glue as we want, and as much cardboard as we want. The boat has to be 8 feet long by 3 feet wide or smaller. The cardboard has to be pre used ( tv box, trampoline, exc.) please help us and hurry!
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