Not too sure you will get a good wooden hull texture using normals alone.
I've seen a few large drydocked boats, and I mean only a very few, and the
lines making up the planks tend to be there more because of varying angles
along their lengths and the resulting change from plank to plank that makes
them obvious at shallow angles to the light. So it's possible you could use
a pigment or diffuse shading instead. Create a patterned texture using
gradual (gradient) shifts large enough to fill a brick pattern I guess. Not
really sure what you'd need to do, just thinking out loud.

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