Actually, I did not buy it at the show. A acquaintance and fellow bike nut from nearby Simcoe bought it, changed his mind, called me and give it to me for a good price, a better price than I would have negotiated. He was over the other day and saw the bike. He seemed to like the progress so far.
The best info on the tube set would suggest it is 531 straight gauge as is fork. Have not been able to verify that for certain.