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Yep, maybe even mound it up a bit as well. Also, make sure that no air leaks between the hair dryer and the holes. The pile of charcoal will create some resistance to the air flow. The air will seek...

No.
Sorry, didn't explain very well. Meant the outside of the inside:confused:
Place the insulation mix on the inside of the bowl. The rectangle I described is a cavity centered over the air...

Bruno,

The big question is what are you using for fuel? If you are using wood it won't get hot enough and the ash will block the air flow. I would suggest using raw charcoal not I repeat not...