I just added 12 x 24 foot onto my detached garage to make my "smok-a-torium". It is 12 x 14 inside with fridg, freezer, 3 hole stainless sink, plenty of cabinet and top space, stuffer, grinder, slicer, and smoker with range hood mounted 4 inches above smoker with visqueen draped down around smoker and I still get the "good" smokin' odor in the room. Not bad out there, but wouldnt want to live with it.
Here are some pics of my home away from home...
Last pic shows the smoker and range hood for venting. Still have the smell of smokin'....