Here's phase one the 3 hour smoke, using all apple wood chunks. I staged the 2 wood bins adding the second after about 90 minutes.
And the 2 hour wrapped phase with rootbeer, soy sauce and butter.
A place to track experiments, inventions, recipe perfecting, successes and failures with food.
I lowered the pans to about 1" off the burner and smoke started at a little over 4 minutes and at 160 degrees. The wood was dry, chips in one pan and chunks in the other. Smoke was billowing at 9 minutes and 200 degrees. The doors leaked smoke, I felt bad that not all the hard earned smoke did not make it through to the top but I'm not sure it's worth sealing. At 15 minutes we hit 225 and I dialed it back to medium to see if it would hold that temperature and maintain smoke, had to go a little lower than medium which was a good thing.
I added a second NG tap and tested the burners.
The flames were perfectly blue. So I was ready to season it. I wiped down the insides with olive oil, put all the racks in, water in the pan, chips in one wood pan and chucks in the other. I added a remote electronic thermometer with the probe in the middle of the box to see how accurate the door thermometer is and what temperature NG can hold. The door thermometer seems pretty accurate.
Upon inspection the wood was starting to blacken and while there was no visible smoke there was a smokey smell. However, definately not enough to smoke food. Is it due to the pans being too far from the flame? Flames not being hot enough? More experiments will be needed. I will likely bore out the orifices. 

Commercial kitchen smokers are usually electric refrigerator like devices that are basically computer controlled, climate controlled environments that you set and forget. An electric element heats wood pellets or chips to generate smoke. There are backyard versions of electric smokers, but they are a little too clean and simple to call them BBQ tools. There must be fire to make it a manly tool.
The best backyard charcoal version is the Weber Smokey Mountain (WSM) which is high quality and generally easy to use by comparison. Meat is placed on 2 layers of racks and the lower rack can only be accessed by removing the upper rack. Seems like a bit of a hassle.