I dig this sweet bike hack. You’d want to be pretty confident in the tubing stability and mounting hardware before offering a ride to anyone you like. It is acceptable to require that they wear tube socks.
John Edgar Park likes to make things and tell people about it. He works at Disney Research and writes for Make and Boing Boing. He is training for American Ninja Warrior. You can find him at jpixl.net and twitter @johnedgarpark — if you like that sort of thing.