This is more obvious on this pic with a Vintage Rad Rolex Cortebert Movement , and a Clai re edition case back with its ETA movement than with the ETA movement of the Pam 36, but it's exactly the same location for the wheels and screws, jewels, etc...
The inpiration is obvious, and that's clever from Panerai to have done it...IMHO.
Best.
Nicolas