I'm late to the topic, sorry. I havn't read this forum in forever. I thikn you are all overcomplicating the curing chamber.
I have one i've been using for a year or so now, i make salame year round, as well as other cured products (pancetta, coppa, bresaola), and can adjust the humidity anwhere between 30-90 and the temperature anywhere between room temp and 0C.
All you need is an old fridge, an ultrasonic humidifier, a temperature control and a humidity control. It works fantastically.
The only thing i'm thinking of changing is changing from a light bult to a radiative heat source (like the ones for terrariums), since i've read that light can decrease the quality of the salame. Whether or not that is true, i don't know.
I'd also like to get some fresh air in there..maybe a small computer fan on a timer through the sidewall.
See details here, and ask any questions.
https://home.comcast.net/~jasonmolinari/Salame.htmjason