This is a quick update. I found some Cellfoam at Hobby Lobby in 1/8" thickness. This is perfect for Calamity, although 1/4" would have worked as well. I can purchase blue or pink foam for the actual boards in 1" and 2" thicknesses so this fits my scale model quite nicely. Unfortunately it doesn't shave down quite the way I wanted it to, but I think I can get it to work in creating the slope, or I'll just resort to clay again.
Again the model has shown me that I need to go 2" deeper if I want to have the special features that I was contemplating.
|A single panel ready to drop in. This represents a piece of foam board 1" thick.|
|And a perfect fit, a second panel will fill up the space|
|The second panel in place. On the left you can see that the top is flush with the plywood edge.|
|Here on the right side you can see that the top piece of foam is fully exposed. I need to shave this down to form a gentle slope. I tried to cut it with a knife but just ripped up the foam. I'll try sanding it down on the next piece.|