1) fill the gaps with slivers of wood and individually cut puzzle pieces, using PVA glue to hold them in place at the stem of the hull.
2) Don't just lay planks at full width over a hull and expect them to cover the complex curves of the hull form. It won't work. You have to fit EACH and EVERY plank, especially at the bow. This is the area you need to improve more IMHO. Soaking and pending a plank is tjust the FIRST step in fitment. Cut, shape and sand each plank and dry fit until they are almost seamless. IT TAKES TIME. That include lightly sanding ONE long edge of EACH plank so that when it abuts the ones below and above it, the seam at the surface is TIGHT. It gets better with practice, lots better.
3) Each plank needs to be glued along its edge to the plank above and plank below it. If fitted properly, the amount of PVA glue should not be much. Wipe off excess before it dries.
Fill gaps with slivers and glue. The first layer of planking is where you can make mistakes, because they can be corrected. The second (final) later is not.
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Because of poor fitment, the two planks on the port side, where the counter meets the deadwood, need to be redone.
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The ends at the bow should be narrowed, and shaped (yellow arrow) and the long edge of the plank that meets the keel (red arrows) needs to be beveled using a sanding block to make the joint at the keel seamless. Please read a book on model planking, and learn how and where to taper planks, and where stealer planks or drop planks should be made. See attachments below.
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The ends of planks need to be angled AND beveled to make the seam at the stem tight. Taking time in dry fitting is the only way to achieve this.
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Some really good pictures to serve as guides:
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Edge beveling of one long edge is necessary to make seams tight, especially at the turn of the bilge.
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Replanking this because of the fitment problems at the stem and stern may be an option, but you will need to obtain more plank wood. I suggest
Midwest Basswood, because the wood is cheap, pliable after soaking, and available on
eBay also. <-- Links in text