I dont think you should bump a thread thats only 9 hours old, it wasnt even off the first page yet.. sometimes you gotta wait a day for a response.
Theres not alot of room in a fridge and setting up ventilation will probably be a bitch, lighting will take away from height, which is already pretty tight. I mean having a little veg section on top and flower on bottom would be cool, but it would be alot of work to make a good grow box out of a fridge. plus it would be heavy to move. And its not gonna be a great hiding spot since who has random fridges in their basement (i know sometimes people have a second fridge but itll be awkward if someone goes to open it who you dont want to know of your plants.
Not trying to hate on your idea, I just dont think its worth the time and effort.