These drawings use a popular aluminum lithograph plate from a #102 Heidelberg press, 770mm x 1030mm x 0.3mm.  This and other sizes are available from government and commercial printers or newspapers.  They are sold for the price of scrap aluminum, about $1.25/kilo.  Staple or rivet small plates together to make any size unit.  We can help design cookers for other plate sizes.

Note: 30- or 32-gauge galvanized steel, stainless steel, or sheet metal painted with a reflective paint will work.  Sheet metal costs and weighs more and is harder to cut and bend than printing plates.  Sheet metal does make a stronger case.

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