I think this might be the lightest full size road frame I have built out of steel. The rider is 5'4" and maybe 120 lbs. The tubing is True Temper S-3 mixed with Columbus 'Life'.
The combination of a fairly relaxed head angle and the light tubing should make for a pretty forgiving ride, even with the fairly large section down tube. I have built aluminum CX frames that weigh more than this one !
The seatstays are probably the lightest I have welded in quite some time. I was really careful not to blow any holes through them.....it was pretty intense welding but it came out really nice.