I have stripped down my retort so that the pictures are self explanatory. this is a very, very sucsessful model.   Materials needed:   2 x 44 gal Drums(removable top type) 6 ft 4" pipe(1 x 2ft &  1 x 4ft )  1.5ft 6" pipe some 1/2" square bar or what have you to make fire  grate 1 x 4-6" bell mouth 1 x 6" flange any type a piece of plate 1/4" for base of drum some tube, 2 x plumbers blocks , 2 x short lengths round bar to suit plumbers blocks , a piece of flat bar a bit longer than