Good morning from chilly upstate N.Y.(17above at 9am).I am gonna start my trailer smoker build soon,hopefully in the next ten days.I have lots of questions for the experts.First question, the smoker chamber is a 375 gal. fuel tank,for the firebox i have a 120 gal.propane tank,what my thought is to cut the propane tank lengthwise,then i'd like to weld a divider about 3/4 quarters of the way across so i can have a firebox on one side,"warmer/oven" on the other then weld a flat steel plate across the top for a "flat top" also for cooking.If i used the feldon caulculator correctly this won't work but i have seen 275 gal tank smokers with small fireboxes.Any and all help is greatly appreciated.I will try to post pics as we get started with the build,have just about all my parts/pieces collected and should have @ $400 in materials and most of that is steel for legs/racks,motor etc.as this will also include a 275gal fuel tank pig rotiserrie on the other end.