It looks to me after reading the smoker site that the difference between a hot smoker and a cold smoker would be a household thermostat.
Were I to build one I would start with a barrel (I dont like the trash can as they are coated with poisen to keep them from rusting) put a household heating thermostat at the top at the same level as the food. I would then run wire down and put a plug on the outside for a hot plate to plug into.
I would then use a little experimentation to find out where to set the thermostat to keep the temperature at approximately 85 deg.
A large cast iron fry pan full of chips and the thermostat should keep you in smoke and at the right temperature. If doing it in the winter I would try to find a way to insulate it. just wrapping it in fiberglass batting might do it.
the temperatures were talking about generating are not high enough to cause concern, I would just make sure I had it away from anything flammable for the first batches.
this sounds interesting, I might just have to try it.
Eric
"Complexity is easy; Simplicity is difficult."
Georgy Shragin
Designer of ppsh41 sub machine gun