What are you using for the benchwork? 1"x3" benchwork, with cross support, and 2" foam is ample for a layout. Why waste time, money and effort adding an unnecessary layer of 1/4" plywood?
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I am building a n scale 40x84 layout, and am considering using 1/4 inch ply under 2 inch pink insulation board. Is this doable or a bad idea?