The goal is to decrease the cubic volume inside of the chamber as much as possible with insulation panels, so there is just enough room for two fermenter. I already removed the outside door and the freezer compartment door and plan on filling the entire cavity lower cavity of the fridge with stacked insulation panels to reduce volume. I then plan on installing a 6" Inductor fan to blow cold air out of the freezer compartment and into the chamber, with another fan pulling air back out of the chamber and back to the upper part of the fridge for re-cooling. It has worked well for my coffin keezer, so I hope it works for this. I think that the keys are going to be filling all dead space with insulation and decreasing the cubic volume as much as possible, maximizing R-value, and making the chamber as air tight as possible is the key. I'm keeping my fingers crossed, but I don't have a doubt that I'll be able to keep primary lager fermentation temps, but secondary lagering down into the 30's may be a bit far fetched for this unit. I'll probably have to get another small chest freezer for that.