Ah yes, I did indeed mean the coffin class cubicle, internally dubbed FB1 and I think the project name for that was Hercules?

My gosh, the pairing of that hard-shell Y seat and the coffin-class J cubicle was not a shining moment for Cathay's product team. I recall a few SYD-HKG-TPE trips in that economy seat, now SYD-HKG is a relatively short leg for us Aussies but my lower back was absolutely killing me by the time I got to HKG.