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Hi again,
As we move back into the art of lashing, it is perhaps inevitable that we will repeat some of the details of its evolution. The materials are what is new -- that Dacron is at least twice as strong as natural fiber, and requires a much lower safety factor -- but the logic is the same. Therefore, consider leaving a "neck" to frap, simultaneously allowing for tighter turns and ring articulation. Consider frapping with a separate seizing, for tidier, sounder lashing turns. Consider screwing, riveting, or even lashing thumb cleats on.
What you have now appears to put needlessly high loads on the turns that go through the ring, to be vulnerable to the failure of any part of the lashing, and to have little ability to articulate. It's a start, and a noble one, but it could be elegant.
As for materials,tarred nylon twine is readily available, and tough. Spectra just multiplies strength completely beyond belief, and can give you lashings that are basically immortal. Multiple turns of small stuff is always stronger than one turn of large, volume for volume. This is why selvagees are stronger than the rope they are made from.
Fair leads,
Brion Toss
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