hi all- looking for detailed information on adding supplemental heat, rotisserie and grill option. I am starting a 275 gallon oil tank reverse flow smoker. I have the doors installed and before I add the partial floor I would like to see how others have added an additional heat source other than the fire box. I am using the calculator to determine the appropriate fire box size. I really could use info on what to use either propane or electric and the btu size and how and where to install. I know that smoking is only effective for 4-6 hours so would like to finish the cooking process with an additional heat source or to help maintain the desired temp during the smoking process. If anyone has plans or know where to find it would be greatly appreciated. Has anyone made their smoker to have the capability to grill with added propane and how to add a rotisserie. Oh one more question -how large an opening should the reverse smoker floor pan be? thanks ahead of time and I will post pictures as the build progresses.