Shellbellc
http://www.smokingmeatforums.com/viewtopic.php?t=843
Above is a thread that I posted for the electronic controls for my Wookie (because it is big brown and I was in a Star Wars kick with my kids during the construction of the Wookie)
srmonty is correct if there is plastic run away.
You need a refrig from at least 1960 (I am not really sure of the year that they quit making the all metal ones)
The insulation is cardboard and does work well.
I just went to Menards in their heating and cooling section to get my smoke stack and the rest is an electric hot plate with a cast iron skillet on it for my wood chips.
The temperature is controlled with a Thermocouple and an industrial temp controller (I used to sell them in a previous life and there was a demo unit in my basement)
I love my Wookie because with the temp controller I can "set it and forget it" I go to work and place a pork shoulder in there and when I get back restock it with wood chips and a few hours after that I have some great pulled pork, with out babysitting the temp.
If you have some specific questions please let me know I would love to help any way I can.