About square gongs instead of traditional ones, I don't have the answer, BUT I can guess that this is a technical choice made by JLC, to make it sound better, perhaps.
I'll ask his question to JLC and will let you know.
Pics are nothing compared to the experience of seeing it in the flesh, if you can see one again, go and do it.
The appreciation of this watch is stronger from day to day, indeed, because there are to many things to see, to get, and to enjoy!
Thanks Allen for your comments, and as for your question, as soon as I have the answer, I'll let you know.
Best.
Nicolas.