When the Apprenticeshop split up a few of us kept tabs on the Lance Lee group. I remember watching a lovely Norse type, not a faering, many small planks, go together with trunnels. Lance Lee had a thang for northern Europe.
Anyway, me thinks to meself, what an elegant way to fasten a boat, even a small one. Not much more labor intensive than rivets. A bit tricky in the moisture content and such, but if done right, no more worry about rotten fastenings, ever!
And I agree with Ian and Jeff et al. Comercially viable, turning a splitter into a trunnel press? Nah. Might as well make buggy whips. It's pretty easy to pound them thru a die.
So many questions, so little time.