Good idea to make it in your way with the papre pattern - Thanks for showing usfirst thing to do in order to build the deck is locate where the deck clamp goes. I did this by making a pattern from the inside profile drawing and clamping it to the inside of the hull. The line above the edge is the actual deck then the space between the black line and the bottom edge of the pattern is the height of the deck beams. Finally the bottom edge of the pattern is the top of the deck clamp. Now it is just a matter of drawing a line on the inside of the hull.
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