Good news. I feel multi-chromatic-locking success is just around the corner.
By the way, there's a new presentation on the DCC from the ANU group where they've locked a short single cavity with both colors - G1000735:
[Koji, Osamu and Kiwamu]
We aligned the beam axis pointing down to both X and Y arm.
Now the beams are hitting the centers of both ETMX and ETMY.
Amazingly Osamu made X arm flashing by aligning the cavity.