Here's how it works with the cold smoke plate. The plate slides into a lower rack guide, and fits pretty snuggly along the sides, front and back, without much of a gap. The plate is about 1" thick, and contains some sort of insulation inside. You place a large pan of ice directly on top of the plate. The drip pan works perfectly for this, and you don't need the drip pan during the cold smoke phase. Make sure you don't put in so much ice that it will overflow when it melts. You can also freeze water in 2 liter soda bottles, and place those in the pan. The belly goes on a rack above. The purpose of the plate is to let smoke through (it only takes a very small space for smoke to get through) while keeping the heat in the lower chamber beneath the plate. Hope this helps you rig up something similar on your own. There are members of the forum who cold smoke without the cold smoke plate, and can probably give you advice on that. Some rig something up. Some place an A-MAZE-N-TUBE-SMOKER in the box and don't use the SI element (the easiest solution I think, as long as there is enough airflow to keep the tube smoker burning). Hopefully they will chime in with what works for them.
Remember there are two phases to bacon, the cold smoke and the hot smoke. After the cold smoke, you remove the ice or whatever apparatus you are using (put the drip pan back under the smoker), and turn the temp up to 200. Smoke until 150 IT. Whether it is possible to set your smoker to 150 right from the get-go, without the ice, I don't know. I've always wanted to try that, since in theory, it would take several hours for the internal temp to get to 150 if the smoker is set to 150, and should get plenty of smoke. Someone here has probably tried that and knows.
I use the 15 minutes, 45 minutes off technique because I have a #1, not a D model, and the box is pretty small. So I have to be careful about running the element for too long and heating up the top chamber. I run the element just long enough until I see good smoke. I try to keep the cooking chamber below 100 degrees for the cold smoke phase. With the larger internal space of the #3, it might be possible to just set it to 150, and not have to cycle on and off, but I'm not sure. The Auber would make that easier.
Bacon is cured, so it is safe to eat when the internal temperature reaches 150. Because it's cured, it's probably safe to eat even at temperatures lower than that, but 150 is what everyone smokes it to. Keep in mind, you will most likely be slicing it and cooking it again anyway (if you are at all concerned about the temperature which you shouldn't be), so you definitely don't want to take it past 150 in the smoker or you will start rendering off all of the fat.
Congratulations on your restaurant purchase.