I'm looking to get a setup going too! I have an old full size fridge already. I'm getting the humidity/temp controller from the main post, and this de-humidifier: https://www.amazon.com/gp/product/B00KWKONAG
I live in SoCal near the beach and not too sure if I need a humidifier too (currently ambient humidity is 75%... I plan on putting a large bowl of salt water (salt to keep away mold/bacteria) and just rocking the temp control and dehumidifier. Here is a youtube video where the guy recommends that setup: https://www.youtube.com/watch?v=1JgxW8hEEBY
I also found this article about converting a fridge. You and I are in the same boat, going "plug and play" as he calls it. http://benstarr.com/blog/how-to-convert-a-refrigerator-for-curing-meat-or-aging-cheese/
Goodluck!