Our retired friend that we left build his 52 at the shop used several unique methods in bed building. 5x10 plywood is readily available so he used a single sheet that has grooves routered in for the bed strips. In place of the large washers with the offset holes for the bed mount bolts he used plastic coated "D" rings. The bed to crossmember bolts are under the bed strips and the strips are held on with oval headed wood screws. The flash makes everything look much more vivid but in natural light the finish and lettering has an old faded look.