Nice find! I am in the minority that loves these skeleton tourbillons, but I'm surprised this manufacturing note wasn't more a part of the SIHH release -- big news and idea IMO. If this technique becomes more prevalent in the Swiss watchmaking industry, there could be a lot of cool new concepts on the horizon.
I searched for a cross-section look of the case (and doubt it would be released this quickly) to see where they trimmed material, but if anyone finds one, that could be very useful. I would also be concerned about possible weakness to stress points, but I'm sure the Panerai folks have taken that into account. Hopefully ...