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You can build a box from 1X4 the outside size of the section. Then put 1X4 sideways in the box every 16" to bring the foam even with the top of the box. Glue the foam in. 2" will work fine this way and will be lighter. 3 inch foam can be used on 24 inch centers and on 8 foot modules seem to be lighter. I misspoke a little, you glue up mountains yet from foam. You carve in ditches and streams. A yard will work on 1/2 plywood and cork sheets or tile too, no foam. I have used damaged 2X4 ceiling tiles glued to plwood too. Ceiling tile also makes great limestone cuts. Also, RTV Silicon works as a glue too. I use clear RTV gasket silicon from autoparts. I use it to stick down buildings and glue foam to wood and paper. It's semi-permant. It will stick a plastic building down to just about anything with only four spots. You can then remove them later for whatever. It also don't soak in and is great for attaching backboards and pictures to backboards. Avoid hotmelt glue on foam, but works great on ceiling tile. I hot melt glued a scene TO the CEILING, a barn, track, trees, and cattle. It's funny.
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