I think Hetchins added material to the end of lugs. That's how I would do it anyway, the scrollwork extensions do exactly nothing positive for the structure. In fact, make sure there is enough butting on the tubing that the extended heat affected zone is not on the thin part of the tube. I welded some extensions on to some lugs for one of my frames, and years later I saw that Peter Weigle brazes the extensions on and avoids all the complications of welding. Doh!