Hackers Help: How to lengthen an IVAR Shelf?

I would like to use IVAR shelving to build a pantry around my fridge much like this:

Photo: IKEA.com

The problem is that my fridge is wider than the widest shelves by about 3 inches. I had thought about cutting two shelves and then putting them together with dowels and metal brackets, but I wonder if you all have any other ideas. Cheers!