The paddle boats look awesome, great job. They will be fun when there's no wind, or in places where youo can't put a sailboat (such as a creek with lots of trees over it)
Just remember, muttering over numbers may look funny and not be much fun but it's an important part of building something right.
My old boat got too small, so I found some wood dad was hiding and Im building myself a new one. I want to be able to pull my boat out in different places from where I launch and walk about with it, so I want wheels with me. My brothers canoes ones didnt float when he rolled his canoe...