storage of finished product

we've recently taken possession of a warehouse unit that we will be retro-fitting to function as our production facility.

we've got almost everything sorted, from floorplans to equipment selection, but i keep getting hung up of the storage of both finished product, and work in progress. modular fridge with adjustable thermostats for storing chocolate would be great, but they ain't cheap. we're leasing the space, and want to avoid the built-ins as much as possible, but i'm considering a purpose built room similar to a wine cellar - controlling for temperature ( 12C ) and humidity ( 50% ? ).

has anyone done something similar with some degree of success? our 'room' would be about 75ft2 / 750ft3.

appreciate your help.

adam