http://www.zerotocruising.com/?p=5191
One of the commenters, a previous owner of a PDQ, had this to say:
MikeWe added to our box as well when we had the PDQ. We went around the sides somehow, I don’t remember. Other friends bought heavy, clear plastic and made overlapping flaps… so when you open the fridge door, you can see in (to ponder what you want) and yet keep most of the cold from escaping. Then reach through the flaps and get your food. Ask on the PDQ forum, I’ll bet someone has pics.