"but they all have that underwater forward protruding prow which would sit uncomfortably with a keel".
Not all, only some Peter. If you want to see a similar feature check out a Bronze Age Phoenecian warship.
As for your second point, why do you readily discard the idea of plank boats being used in the Neolithic? As Mr Lifter points out, we know the carpenters were up to the job and the materials were readily available. There was obviously a decent knowledge of seamanship in the Neolithic. All the elements are there, all we need is for someone to dig one of the buggers up. Maybe, one day, one will be found on a submerged Doggerland beach.
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