New guy here from Washington that loves smoking fish. My smoker is homemade, 4'x4'x10'. I use a propane burner and a cast iron skillet to hold the wood. The nice thing about living here in Washington is, when I'm ready to smoke fish, I head out in the back yard and find a nice green maple for some good smoke.
The smokehouse is about ten years old. It is double walled and insulated.