The Bike of the Week section of the Steelman web site (
www.steelmancycles.com) has several examples of full sized (55-60cm) Dedacciai steel bikes under 18lbs and a couple under 17 lbs. Of course, you pay the premium for a Steelman frame, but these bike are both feather-light and works of art.
I'm saving my pennies (a whole bunch of them).