Trying a different way to connect stringers to stations.
Such lobster claws snap onto the aluminium tubes, and allow instant collapsing of the structure.
Okoumé stations are lighter than polypropylene or polyethylene stations, stiffer, but the building time is much longer as you need connecting blocks to match the stringers' bend wrt the stations, and you can't fit the clamps directly onto the plywood edge since it's laminated and fragile.
A better solution could then be to build compound stations, like on prewar kayaks.
Still, enough weight was saved so to keep the total weight under 15 kgs for easier portaging, even though I used rather heavy 18mm diameter, 1.5 mm thick tubing (instead of e.g 1.2 mm i.e 0.49" if you're not familiar with millimeters)- as another purpose was to build a sea yak that should be able to hug the shore including paddling around capes when the wind picks up).
As a result we have a structure that's sturdy but lacks flex -not quite a problem on a 4.375m boat, though.