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I agree with Ray. Styrofoam is the way to go. Not the beaded stuff. The extruded stuff is readily available in Home Depot type places but the way I get it is even better. If you are really polite, go to construction sites where they are building houses using the stuff. You'll find a dump site or maybe a dumpster box full of cut-offs. If you ask nicely they'll usually give you lots just to get rid of it. You may have to pick it overto find the cleanest ones but you can pick your sizes which can save a lot if cutting later. I use an old kitchen knoife with a 9" blade for cutting. The blade is flexible which helps. I tried using a hot knife but the stuff sticks together again after the blade passes through. And it creates fumes. I use carpenter's glue. It takes a bit to set up so you can move things around a bit if you need to. I have a 9" x 13' HO layout built only on 2" styro glued to L-shaped wall brackets of 1"x3" spaced at 12". No need for further support or sound deadening. It's equally easy to stack it for mountains and you can excavate for ponds etc. Great stuff.
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