The tubing is all there. It's just that someone cut the lower backbone support out and it's hanging on a wire, sorry if it's hard to see in the pic. There was a piece of flat bar wrapped around the fork neck and welded solid. I don't know why just guessing, a track bike modification? The problem with this frame is that the backbone tubing has been heated and bent. My guess would be a wreck and someone was trying to straighten things out. Also I can see that the seat-post down tube has been heated as well but it doesn't look to be obviously crooked. Another clue is the frame has bits of yellow paint on it here and there and the forks are orange. I understand the way these frames where originally built using tubing brazed into cast sections; ei. neck area, seat-post, engine mounts, etc. I understand the process but I don't have jigs for the correct frame dimensions and I don't have the experience with undoing these joints and correctly fitting new tube in it's place.
Thanks all for your interest.