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Jarrell, I have followed your layout development from day one with much interest. I can offer you one alternative which may work for you as I had a similar problem. To cover my risers and trackbed, I filled underneath with scaps of foam (which you don't seem to require) and sprayed a top coat of "Great Stuff" liquid foam. Many will poo-poo this option because it can be messy, smelly, ...essentially pick a word and add "LY" to it[(-D] Cover everything you don't want liquid foam on with masking tape. Then build the foam up from the bottom to the top. Keep in mind that it expands. When it's cured (usually 24 hours), you can cut and shape it using a knife, xacto blade, surform shaper et al. After I had shaped mine I then gave it a couple thin coats of ready mix drywall compound. When dry you can sand it if you like, but with some clever knife/trowel work you wont have to. I then finished my "rock cuts" with WS Earth pigment and ground foam. It looks great. Using this type of foam also give you a base to stick trees into that is firm but not hard. Best of luck on what you choose, Trevor [:)]
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