All that needs done is to weld the two chambers together, coat the outside of them with soem kind of corrosion protection. Add a water fitting to the stinger. Then make a new pipe/jacket to go all around the chambers. Block off/weld up the hole inside the head pipe. A fitting would need welded near the head pipe on the chabber so you could fill the water jacket with water. Then you would need an exit fitting to push the water into the stinger fitting.