Did you mean that there is 1/2" space between layers in the firebox? Your logic seems sound to me. I don't know about steel cookers, but with the ceramic thermal mass of my Large BGE, I can get 20 hours @230 without opening the lid with Wicked Good and my Stoker. These are equivalent of an insulated steel cooker I'd think.
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-Tim
Traditional Santa Maria Pit
Mini, Small, Medium & Large BGE
Weber 22" OTS & 26" OTG & 18"WSM & WGA
[COLOR="Red"]Each wearing custom handles from Marty Leach[/COLOR]
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