I have a question about how to keep track of graduation lines as I work on the inside of my soundboard and backboard.
I'm using a graduation map that I have on paper, and I've got multiple photocopies. You can see the graduation map lightly pasted to the underside of the soundboard in the attached photo; I used it to drill to rough depth. I have the outside surfaces of each of the two plates to more or less finished contour dimensions, and I've hogged out the inside surfaces to within about a millimeter or so of my goal thickness. The drill holes are gone now.
Here's my question: I have the tools I need for graduating the plates, and I have a map on paper, but I'm not sure how to keep track of my graduation goals. I can draw the lines on the inside of the soundboard, but then I'm going to lose those lines as soon as I make a pass with the thumb plane or the scraper. Any suggestions for good methods to keep track of my targets while I'm removing the wood I've just written on?
Thanks for your help.
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