I just researched your Titanium Blue Ceramic. š
A very intriguing piece, too.
I have a 16,5-17 cm wrist
and normally not even a problem with a 47 mm Panerai.
My Titanium Greyās case size is 42 mm, too, with a 52mm lug-to-lug length and 14.5mm thickness.
I think these are the same dimensions as your Blue Ceramic?
All the best
Thomas