Deck Plating Blueprint - Top & Bottom Layer Plate Dimensions and Spike Spacing

This is a hand-drawn dimensioned blueprint page (signed "Johnston") showing three sizes of deck plating plates, each drawn to a stated inch/foot scale bar (0-3 ft). The top drawing, labeled "Deck Plating - Bottom Layer," is a 4'-8" x 3' plate with a full grid of fastener holes spaced 4" from edges and 8" apart across the field. The middle drawing, labeled "Deck Plating - Top Layer," is a 6' x 3' plate with holes only around the perimeter (4" from edges, 8" spacing, corners at 2") plus a few interior holes noted at 16" spacing. The bottom drawing, also "Deck Plating - Top Layer," is a 6'-8" x 3' plate with the same perimeter hole pattern and 16" interior hole notes. A note at the bottom states: "Deck Plating - 2 Layers of 1/2" thick plates spiked (1"?) to wood decking," with a bracketed remark that the "plan drawing indicates 3 various sizes of plates." A reader learns the plate dimensions, hole/spike spacing layout for both layers, plate thickness (1/2" per layer, two layers), and the attachment method (spiked to wood decking). This appears to be marine/vessel armor or deck construction documentation rather than an automotive diagram.