I did a review of the weights per step for the clinkered punt. The per step jump in weigth is now explained as X from this and Y from that.
It came out even higher
at 310 lbs
Which im pretty sure is beyond anyone's ability to lift.
Thats not completely bad as the big boat is supposed to be on the water.
It would also explain why typical NPC uses the Finnish punt which can be carried about.
The clinker would work for someone on the sea or along the major river networks and lakes.
A one person portage of a 310 lb clinker is going to have to be a push the boat.
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Im not sure what the upper limit for carrying is but I think 310 is beyond most characters even in their undergarments.