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I'm building my first N Scale Layout. It is 8'x12'. I used 1/2" plywood covered by at least 2" of foam (4" in some places.) Here's what I learned. - It can take more than 2 weeks for glue to dry when gluing large pieces of foam together. Its much better to wait for the glue to dry before shaping. - Both Liquid Nails and Yellow (wood) glue work well to glue down the foam. Yellow glue is cheaper. - If you uses latex caulk to hold down your track, keep in mind that small pieces of foam "dust" will stick to it and not come out easily. If this happens - leave the foam dust there until you paint the track. If you use floquil or other non latex based spray paint, the foam dust will melt away. I suggest doing as much carving as possible before putting down track. - Don't bother with a hot wire. A sharp steak knife and Surform will do the job. - Use soft sanding blocks for detail work. - You can use non-latex spray paints on your layout, just be sure to put down a coat of latex based paint first on the foam. This is especially important when painting track. - Don't get too worried about making perfect cuts and slopes. I used Sculptamold to fix areas I wasn't too happy with. Its a lot easier to put down Sculptamold than it is to delicately shape foam.
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