The old swimming pool filter housing from the villa my late parents had in Menorca made a top twin-tub barbi' when split into 2 parts and concreted into a breeze block base, with stones piled around it to match the pool surround walls. But it was a bugger to get going - charcoal and wood to get it going in the third world manner described by allan-the-abbo - and about 3 beers later it would be roaring away.