They are both surfer terms. Hang Five means to hang five of your toes over the nose of the board. Obviously Hang ten means all ten toes over the nose of the board.
Oh thanks for explaining.
Anyways, this thing looks AMAZING! And I can't wait to see the giant bucket splash, it looks REALLY amazing. And I like how you tucked away the slide for later, but one question, if you have it, why not just install it? Unless you want to attract more people next season with a BRAND NEW SLIDE!