So. ship planks varied in width. The garboard planks next to the keel would be 2-3x wider than the rest of the hull.
Also, they wer not a uniform width the whole run, either. A nominal 6" wide plank amidships might be only 2 or 3 inches at either end (on vessels short nough to have a single plank). Technically, the top edge is what is scribed, and part of the back edge is "backed out" to fit the frames.
That's the rivet ounting of 1:1 scale construction.
Let's suppose a 6 inch by 20 foot plank at 1/144.
That translates to 0.0416 by 1.66 inches, a skosh more than 1mm x 42mm. Just the thought of engraving at that sort of dimension makes my eyes ache
I have no real answer, just noodling on the notion.