It appears from the photographs I've seen that Vasa's hull planks do not taper toward the bow until the level of the lowest of the four wales below the lower gundeck, at which point they taper sharply. Is that indeed the case, or do the planks begin tapering higher up the hull?
Good question. There is some tapering in all of the strakes below the first wale, but more importantly, there is a lot use of drop strakes to reduce the girth between amidships and the bow - there are 22 strakes below the first wale amidships, but only 11 hood ends on the stem. The planking plan is different on the two sides, with drop strakes running out in different places and with different joints. Above the wales, the planks are of very consistent widths over most of the length.