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Make it as wide as you'll need for roadbed and any trackside scenery. Glue the cork to the plywood. Both thicknesses wil be ok, with support every 12 to 16". There is almost no weight bearing on it and I assume you don't subject it to monsoon rains. If there is a sag, I think you will need scientific instruments to measure it. You probably will also be adding attaching scenery to it which will provide additional support. Since there is hardly much more work or cost involved, place your supports as close as makes you feel secure. Wayne
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