If it’s not too late, measure and map out where the box mounting fasteners go in your replacement planks. It will make building your new planks much easier for your cabinetmaker buddy.
Paul, I haven't ordered the wood planks yet. Are you talking about these bed mounting points in the picture?
Those are the ones John. If I remember right, the washer gets let into the planks maybe 1/8th or a weak 3/16” and then the bolt hole is drilled off center. I had my old planks to use as patterns, but your patterns were/are dust.