Elon has said in several occasions that outfitting Hw1 cars with Hw2 hardware would be like spinal transplant surgery and be costly and near impossible. I remember a while back it was discussed that the car could be separated from the battery for a "battery swap" for a fully charged battery and you were in your way. I assume battery makes up a major portion of the cost in a new vehicle, so what if a hw2 vehicle shell was transplanted on your current hw1 vehicles battery for a cost. Then the hw1 could be put on a new battery and sold cpo with a brand spanking new battery. Unrealistic? Or just crazy enough to work?