Decided to double check the hull before trimming the seats because after the seat sides are created, it's very difficult to make any further changes. I tweaked a few things using the scale tool applied to difference layers. I built each layer as a boat part (e.g. shear plant, chine plank etc). Still trying to keep hull weight and the boats purpose for rowing, fishing and photograph in mind, I reduced the bow height to 21", which will be fine for the protected waters where I plan to use this boat. I raised the minimum shear height to 14 inches for good rowing oarlock positions; this required I do some proportional scaling (manually) from the bow to middle of the boat for the sheer and mid planks. Lastly at 4 inches draft the displacement was 260 pounds which was a bit low. Against for rowing without an outrigger, I scaled the overall beam to 41" wide and increased the bottom beam by almost two inches to raise displacement to 300 pounds--a knowing compromise to get better initial stability while probably reducing speed.
I shifted the mid seat aft by a few inches so it was over the center of buoyancy (`6.4' from stern). From prior boats, I know water tends to pool in the end seats so raised the ends by a half inch so they had a gentle slope. Using the point>intersect-layers command identified where each seat intersected the middle plank. Then it was a simple matter of collapsing the points outside the hull so their outside edges fell on the mid plank points.
The results are below:
Next time I'll add bulkheads and the hull weight estimate.
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