Has anyone used this from the one posted in this forum? It seems that the plate opening from the cook channel to the smoking ares is not that wide but in most builds I see a normal 6"+ on square builds. Should I assume this is for insulated units? I can't believe this is used for both insulated and non insulated units as the heat loss is a factor in smoke box design. I guess you could always build the box to the larger size in an insulated and never use the full size and or stoke for making chicken etc when you want around 300 - 250 in the main chamber. Then what about making a warming section that feeds from the main chamber or should you only use the firebox to feed the warming chamber? Thoughts? D.