I have a similar model, a 2021 2108DS. I installed shelves in both closets on the sides of the Murphy bed, both cabinets underneath the bedside tables and the rear closet in the bathroom. I used Baltic Birch plywood, nail gun to assemble, supported by assembling in an upside- down u-shape. I hope pics demonstrate the build. They have been rock solid for over a year, including our current 3 month trip from Nevada to Alaska (and back, we hope!)