The lumber shown below is two 15-piece bundles of 1" x 2" x 8' that were acquired for $0.69 a piece or about $21.00 total. The benchwork for all of the shelves and the peninsula--basically everything except the helix--will be constructed with this material.
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The first lumber purchase for the CSX Clinchfield Division benchwork is sitting in the corner under the areas labelled Scene "B" and Scene "G" on version 1.0 of the track plan.