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[MarkR]

Hey all, i am new to this site and what a surprise to find all this valuable info in one spot.  :thumb up:  i plan on using  some salvaged material i have stumbled upon over the last year or so. I'm in the hvac trade so I'm fortunate to be able to acquire these things for the bubble.
Well basically i plan on building a downdraft gasser, very similar to jackals design. I have a 500 gallon tank(4 ft x 6 ft) for the tank and i was thinking of using the middle part of a 275 cutdown with a secondary attached to it. I am sort of at a standstill because i am unsure the metal will be thick enough. i plan on putting two supports on each side to stabilize the side panels. i am also unsure that a 30 inch deep 30 inch high and 24 inch wide fire chamber is going to be big enough. its sort of a catch 22, make more room for wood but sacrifice your water content. looking forward to hearing any thoughts.

[Scott7m]

Lots of variables in there but don't concern yourself with water capacity to much.  Some of the most efficient gassifiers on the market are under 100 gallons

[jackel440]

Your firebox dimensions I think are way to small.I would definatly go bigger on it.