Right - from the start.
Firstly, you are looking for somewhere for air drying with a temperature of around 12 - 15°C (ideally) and with a good relative humidity (RH) of around 70% (ish). It's also good if it has a little bit of air-flow; not much, just a little.
A fridge, or somewhere that needs all sorts of electrical devices, should not be the first choice (in my opinion). Do you have a cellar, pantry, outbuilding etc that has these conditions or near to them? You can check with a normal thermometer and a cheap hygrometer - these are cheap on ebay (search for hygrometer) - something like
this (not a recommendation - just an example).
If you can't find anywhere that's even near the target figures, then you could consider adapting a fridge or freezer. The minimum in this case will be to control the temperature - one of the temperature controllers from
Forttex or a similar one from ebay will do this.
Hopefully that's all you'll need to do.
I guess we're best to leave further adaptions until you've done the above. There's no point going into things at this stage that may be unneccesary.
If you have any problem/questions just post them back here.
Phil