Thanks for the tips so far. Ive got both tanks now, but haven't cut yet. I am looking for what to do for a flue pipe. My plan was to exit the rear of the firebox, head up about 6 inches and 90 degree and send the flue horizontal all the way to the front of the water jacket to maximize water contact and then T off at the front where the flue would continue up while I had a clean out on the front of the unit. I can't find any large steel schedule 40 6 inch fittings though for a 90 degree and a T. Do you guys have any suggestions? I was also thinking about contacting a well drilling company to see if they have any 6 inch well casing scrap that they would like to sell.