I'm after the plans for a field oven, complete with griddle, and a put & take boiler/watr heater. The ones made from 50 gallon drums, CGI and wire. I recall the designs being in a pamphlet back in the 80's, the one that included waste burners for field hospitals? I'm hoping to have these built in my garden in time for summer, so any help appreciated. If anyone knows where I can get hold of a Soyer stove, let me know? Thanks in advance, plans and drawings preferred to description.