ESBIT type "stoves" are the most forgiving in terms of design. All you really need is a sheet of tinfoil or what-have-you thick enough to resist burning through. Or a rock if you don't mind making the rock ugly. The need for quality in the stove is much greater when working with pressurized appliances such as those that burn high BTU petroleum gas or liquid fuels.

Of course with an ESBIT type stove, the money you save on the stove is spent on fuel. ESBIT type fuel is the most expensive of all backpacking type stove fuels.

HJ