I am going to do a decent writeup on this combination project; fermentation chamber and BrewPi temperature control.  this project is nearly complete and will be written up real soon.   I used our old fridge for the chamber, essentially converted into one zone instead of fridge/freezer, and added heat.  I would start to write it up sooner than later, but as I start to wrap it up I am making little changes here and there

Temperature control is a BrewPi suystem, using the older arduino setup - but rather than run on a rasbperry pi, I am running it on a Debain virtual server at home.   I will also be adding a link so you can take a look at what I have fermenting at any given time.  Not only is it super precise, but I also only spent at most $50 on the whole project.