I wish you luck and hope that those barrels are solid. If the stock head has split and or cracked I would not do the butt transplant. If the barrels are good then a new stock would be an option. Never add up the money or even time in a project gun if you can help it. As to value who knows. Sometimes just bringing a gun back from ruin makes it worth while. There was a high grade Lefever that was cleaned up and made into a decent shooter that many experts had passed on as being too far gone. It lives. Perhaps you found another one.