I pretty well finished the new rear sub-frame, all with Chro-Mo tubing. But first, I got to share some lobsters with my wife and my youngest son, Brian. At 3$ per pound, they're hard to pass up.
The second photo shows what happens when the senior mind starts to revert back to that of a guppy. I bent and profiled the front of this diagonal strut, marked the cut in yellow, walked over and put it in the vise, and promptly cut it vertically instead of horizontally. Thankfully, it found a new home further back. Rear view of finished subframe. It looks simple enough, but each tube has a bend either at the front or the back in order to make clearance for the gas tank, which is 1" wider than the frame width, or for the back wheel, and must also clear the inside of the rear streamlining. I think I got it right, should be about 10x stronger than the original due to stronger tubing and diagonals.
I still have to make a new seat hoop with the front gas tank mount, and finish drilling the front lower frame loop for the motor mount. I can't do that until I re-assemble the motor and bolt it in to make sure of alignment.