Hi Brad, good to see you here again.
Have you got any ideas for experiments to tickle this idea with? The RNA World people have done some things with exo-cellular replication just lately that are continually bothering me. They seem to indicate that reproduction begins as simple linear accretion in strands. This does occur in both directions, though, so perhaps a variation from this (at right angles, as it were) is what produces the triplets you are looking at. Unless I'm missing something important?