A friend has a commercial fridge with a glass door like you see in stores with pop. He just uses a 120 V hot plate with a controller he bought on Ebay for $120 keeps the temp at 140* within 10* +/- A pellet smoke maze provides the smoke.
Holds 50 Lbs. easily, sausages hang on 1 1/4" dowels
https://www.ebay.ca/itm/DIY-Plug-Pla...72.m2749.l2649
The controller works very well for 1/2 price of an Auber unit