Section 2.3 (Building Interior Assessment, Cleaning, Maintenance, Repair and Inspection) pertains to the interior of the packinghouse. The requirement is that walls, floors and ceilings are without crevices, along with Form G, which requires no holes/crevices/leaks in the building (e.g., walls, windows, screens), and floors, walls and ceilings that are clean and free from garbage, spills, rodent droppings, etc. There are no specific requirements for what materials are on the walls. Therefore, the plastic/wood scenario is acceptable as long as it is possible to clean it.