Kitchen items have had replaceable materials a long time, you can change top and front of the doors. This is why it is so important that you model the items exactly as described. These Items are also special because they snap to each other and if the material is not exactly the same, it will not look good.
If you have trouble getting the material to look the same as the existing kitchen items in the planner please use the max-files I have attached to pick the materials for ogre, unity and photo.
Please make a kitchen base cabinet with sink. Look at kitchenitems.max and pick one of them