The notches have a discrete step at frame 27, if memory serves me correctly. The step is from the fore- to the quarterdeck. The notches of the fore deck should have their own upward sweeping curve towards the bow, while the notches, belonging to the quarter deck frames should sweep upwards towards the stern. Both curves should show a smooth curvature, although some variation is inevitable. Also, at the keel, the lower edges of the frames should form a smooth conti curve over the entire length of the keel. See the attached picture.
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