Here's one my son built a few years ago:Picked up this 250 gallon diesel fuel tank for $100.00 yesterday. Trying to decide to go vertical or lay it over and put buttrfly lids on it. Should have a trailer by Sept. and a buddy is looking to give me his fried 30 gallon air compressor for a firebox.
http://www.smokingmeatforums.com/forum/thread/91352/275-gallon-oil-tank-pig-smoker
Bearcarver