Gathering the materials for the project at hand for today. This is an experimental depressed deck double module that Terry from T-kits did. The deck sits 2 inches below the top in dadoes that were cut around the frames that make up the fascia. This way I can cut my river as deep as I want.
In the first picture of the module you can see a 2" piece of foam that Terry supplied as part of the packing material so that once assembled it is easy to check that the foam will be flush.
Two inch foam is not available in my immediate area; however, my local Home Depot has 1" x 24" x 24" Foamular Project panels, https://www.homedepot.com/p/Project-Panels-FOAMUL…/203553730. I will "sandwich" two panels together using Loctite PL300 adhesive for foamboard.
If you use these make sure you take your tape measure with you to measure the foamboard panel as all panels are not created equal despite the stated dimensions. In this case I made sure that each panel was as equal as possible before selecting them. You may have to pick through them for any imperfections from being stored on the shelf just as you would if selecting dimensional lumber.
You will have to trim the panels to fit the double module but don't throw away the excess. Save the excess for future landscaping applications.
I have been involved with N Scale for a long time (not as long as some) but N Scale has always been my choice of scales. I have had different layouts over the years, mostly what some would call traditional layouts ranging from hollow core doors to starting on an around the room project.