0Hiyadudez 8 years ago ReplyUpvoteJust like Kiteman said, its not a simple as just building a ball. The pressure put on the knex would just simply snap. This means that you would need it to be a few layers/inches thick, and at that, to fit a human in, would be very hard and time consuming. How many pieces on average do you have? I would think this idea would take somewhere between 15,000-40,000 pieces.