Dad, brother in law, and I cooked one a few years ago. Our 'pit' was cinder blocks stacked two high to make a base, then I had a heavy steel grating that went on top of the blocks, pig on the graiting, another layer of blocks on the grating, and tin on top. Shoveled charcoal and wood chunks in from the end. Cooked all day and had relatives and neighbors over for supper. Was a lot of work, but turned out well.