To give some support to the gunwale assembly (side
to the end gunwale) I put a large pop-rivet through the side
gunwale (left picture) and drilled an over-sized hole in the folded flap of the
end gunwale (middle picture).
I found that cutting a notch at the end of wooden piece C gives
the side stringers some extra support (right picture). It does make assembly slightly
tricky though.
I used a PVC based canvas and glued the 2 halves together
instead of sewing (special PVC glue used for rubber-ducks). Gluing
became difficult towards the ends but result is super-watertight.
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