Takes alot of stuff to put together and i think it would be too much stuff to carry around but if im car camping it could be a worthwhile venture.
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Adhearing to the KISS princeable without reinventing the wheel my suggestion would be a couple lighter fluid type hand warmers. Ive found one inserter into a small pocket stiched into my sleeping bag foot box works wonders sooo I ASSUME where one is good several could be better or may... just qualify as a portable sream bath in some quarters.
So I haven't clicked all the links here but something you could try (might have been mentioned already) is http://www.omega.com/googlebase/prod...FYVFMgod_AIAeg
Coupled with a fuel cell from http://www.horizonfuelcell.com/store_us.htm could get you through the night quite nicely, but not cheap.