Since this is my first post, please correct me if I do something wrong. I have just purchased a MIG welder and need to use it. On the advice of a friend I saved my old 80 gal solar water heater and removed all the sheet metal and insulation. I wish to convert it into a smoker on wheels. I am looking for suggestions on vertcal vs horizontal; charcoal, electric, gas? as the heat source; internal vs external combustion chamber; venting etc. I thank you for any help.