Small builds like this could be made out of 1" xps foam as well. It would not be susceptible to moisture intrusion. My shelves in this foamie are made out of 2" foam with channeled flashing along the face. Then I used what is called the "Paper Bag Floor Process" to cover the counters and back splash. Basically glued on paper stained and then coated with polyurethane. This of course is much bigger, but could be down sized easily.