Man Terry. I'd have him dissect it and recreate from scratch that pattern. THAT'S a show stopper!!I will show it to Dave. He could certainly replace the sleeves and the back yoke, but the rot is on the middle back piece. That rot was not as apparent as the other when I bought it.
I had that thought when I bought it. The zip sleeves are unusual on a Californian unless it is a MC jacket.
Dave S. has some very nice goatskin. I'll send him some pics. Haven't talked to him, been hiding from the heat.