I’ll chime in as well. The area under my layout is storage for all of our Tuperware containers of household and seasonal decorating stuff, and train stuff, so I wanted something to cover it all that went to the floor. I had some closure planels left over from a backyard gazebo set-up, so I shortened them, and placed them with openings as needed, and held them in place with brass screws and brass finish washers. The finished trim on the top, covers the edge of the benchwork, and 2" foam base.
Here is drawer set-up I built that holds rolling stock.
Mike.