Linn Westcott's book is all you will need for benchwork. It describes L-Girder construction so that you can incorporate grades into your layout with minimum difficulty. It's still available on Amazon because it is a classic. My layout which is now 32 years old was built with 1/2 inch a-c plywood, 1x4's for the frame and legs, all secured with drywall screws. No glue, no homasote and no need for 3/4 inch plywood or 2x4's. Building the benchwork is one of the most fun parts of building the layout. While I'm shooting my mouth off I would strongly recommend Gargraves phantom rail track, Ross Custom switches, Midwest cork roadbed and Tortoise switch machines. 32 years later everything still works.
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