My BIL uses a similar, very similar design to that one, for his salmon smoking. It is based upon 4x8 plywood, and the fire box is a hole in the ground. Super inconvenient when you are lighting the fire, bent over a hole in the ground. But, it works great for cold smoking and warm smoking. Yours is nicer, with that fire brick on the bottom.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."