I looked it up to, and you are right, the key is to get the air/fuel right.
I end up buying some SS tubes on amazon with the air registers on them and I plan to use some old stove jets to supply. I will use compress air to ensure that I getting a vacuum first before first light. Should get them in this week.
http://www.amazon.com/gp/product/B00L20 ... ge_o00_s00I looked at doing the ones with the pipe burners, and they seem to be the simplest to do, but to get the air registers was very expensive (50USD for one) and I would not get it in time. The Chinese place in south has something like it but missing the major parts.
You know the smoker that Pricemart had a few months ago, the round vertical one? Look at the burner on it and you would see the type of register I talking about.
I plan to use a 55gal drum with six tubes. I bought some fine bits to drill out the stove jets to get the right amount of fuel to the tubes.
I have two SS grill that Pricesmart had and will be taking the measurement from those jets to start with.
Drop me a line 644-3502, if I not available the message will get to me.