It may be a bit late to help you, but I have now uploaded the recolouring resources (PSDs) for folk to use - all you need to do to create a white base is to stick a plain white texture under the shading layer.

Sorry there are so many bits to recolour - I really would have liked to repository the set, but all the individual parts were mapped completely differently, even though the meshes are so similar (pesky EA!).