I haven't flown new J on AY, but I think there is still 1 MD11 left to convert. There are differences in the interior in each of the planes (AY has a real mismatched fleet). MD11s are wide enough for 2-3-2 J seating and I imagine that the online seat map is wrong (or rather, they make a subset of the seats available online, that every single plane has, and then manually assign the extra seats which differ from plane to plane).

Good luck with the BKK lounge situation, there is still a lot of construction left to do at the airport and most of the lounges are still not built. After all it has only been 2 months that the new airport is operating (the automated baggage system is also not working properly, so some chance that any bags you check will miss the flight). AY food is OK but not great but their wine selection is excellent (not so much expensive as well chosen and interesting). It isn't trying to compete with CX F wines, but is better than most airlines have in J. Service tends to be mixed (combination of IB and BA), however the greatly improved J amenities help a lot. I've had lots of chances to fly AY in the new J, but chose to fly BA/QF/AA instead.