42mm is the exact size of the original 5218-301/A Mare Nostrum, 5218-302 Slytech Mare Nostrum and 5218-304 Slytech Mare Nostrum (bezel without graduation).
It's a re-edition to the original Pre-V MN with same caliber ETA 2801-2 fitted with a Dubois-Dèpraz chronograph module, I don't see why they would have changed the size. For once a re-edition is exactly similar!
I think there are already enough choices in bigger size from Panerai.
Who has already been able to wear a PAM300 (52mm) without his table neighbor saying "WAOU you can attach a clock on your wrist?"
PAM716 is a good marketing stunt for Panerai, but be aware that this wasn't a very good deal at the time for OP S.p.A, they have long been stocked and 435 unsold were transferred to Vendome group in 1997.
1000 Mare Nostrum 301/A were manufactured by OP S.p.A (990 + 10 prototype), on this 1000 MN, 489 was sold by OP S.p.A, 397 transferred to the Vendome Group, 100 used to make Slytech watches, 7 given as prizes, 3 gifted to Com.Sub.In, 2 sold to MM, 2 given to MM and on the 100 Slytech 31 MN302 sol by OP S.p.A, 19 MN302 transferred to the Vendome Group - same number for MN304.
I like this Panerai, it's an atypical Panerai but it has charm and is unique.
But sincerely I find it stupid to buy a re-edition at 10,000 € while looking for a bit we find the original pre-V MN with mahogany box, Pre-V screwdriver, original strap and libretto at 12,000€ !