I would expect the horizontal chain link material to sag between the horizontal crossbar supports. If not right away, then over time as the hulls slide in and out.
No, sorry, that's buried in the español description,
"...tensa y soldados al ángulo de hierro." The chain link is pulled tight and welded to the horizontal angle-iron rails. The transverse crossbars might not even be necessary, but are there to
give additional support and to provide additional rigidity to the structure as a whole.
...
If you are committed to using tensioned fencing as the support then I suggest the metal crossbars be curved downward in the center or positioned slightly below the level of the mesh so that when the mesh sags the cross bars do not become pressure ridges.
If the cross bars are providing actual load 'support' then the mesh would be not providing evenly distributed support along the kayak length.
I presume the steel structure is to be painted to limit rust. Everywhere there are welds the galvanizing of the fencing mesh will be compromised, and therefore need paint.
Some sort of stubby feet or legs would allow air circulation and reduce rust on the bottom surface of the lowest frame rails.
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