I like the current way I'm making these jigs. Starting with a reference line I use only the blueprint measurements at first. Then, I use the tracing paper to trace the rib lines and match that up with my measurements when I use the pounce wheel through the tracing paper onto the jig. I don't rely on the transferred rib lines for the shape of the rib, only for which way to tilt the wood holding blocks. I use the precise measurements to place the holding blocks to try and be more accurate.
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