saw a cooker made from an old 9kg gas bottle, legs bought it up to a comfortable level laying on its side and a oblong hole cut in the side to hold a grill, (looked like reo) the valve had been removed and a door for the firewood and the other end had a 2inch chimney all compenents fitted in the bottle itself, so space required was miniscule
The Maker had a display at the Perth C&C show complete with a range of accessories. There are several plans etc. for DIY versions floating around various C&C and 4WD sites.
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Old age and treachery will overcome youth and enthusiasm any day.......