Welcome to the forum. Your steam powered concept is not so far out. We have members who want to put wings on a bike and fly it. Hang in there and keep us informed of what you build. If I can make a suggestion; start simple. Install a motor on a bike like most of us have done, ride it and enjoy it then turn your attentions to wilder ideas. Keep us informed of your progress.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"