Bill, I have no doubt that at some time in the past you've looked at the LuxuryLite site, but with the hope it can jar another idea, here's part of what it says: "LuxuryLite® Frame Set: Weight of the carbon/aluminum frame alone with no belts or Seat Pad is 10 ounces.
The frame is made with two telescoping pieces that do not lock into place like traditional external frames. The lower frame section is made from ultralight Easton aluminum tubing with epoxy bonded joints. The upper frame piece is epoxy-bonded carbon tubing so it's never hot in summer or cold in winter when you grab it. The larger upper carbon vertical tubes slide over the smaller lower aluminum tubes to keep dust and dirt out. Each vertical tube has an internal cord you can tie shorter, if you wish, to limit the frame extension." Perhaps you could even scavenge pieces of this frame and insert them in yours?