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Square up a suitably thick piece of binder’s board. I am using 2.0 mm thick Thompson’s Mill Board for a small octavo. Since my tray walls abut the outside edge of my base board, rather than sit on top, I only include the amount of material that will be within the tray, plus the book. In this case, I am adding a couple of thicknesses of covering cloth and two Suedel covered, single-ply Bristol board as ‘pads’ in the vertical measurement, and a single Suedel pad, a piece of cloth, and 3.0 mm board (the fourth wall) in the horizontal measurement.
