Ludo,
Whilst reading up on the Marianas, I found references for
IJN 4.7"(120mm) fixed HAA
plus plenty of references for 25mm twins, & their smaller sister, 13.2mm twin MG ground mounts.
None of these exist in CFS 2, so I thought I'd have a go at making them.
The 120mm is based off my Flak 18 88mm model, the 25mm is based off Stuart 277's shipboard 25mm twin, with a new mounting.
As the 13mm & 25mm were both Hotchkiss designs originally, the 13mm twin is a smaller, simpler 25mm mount.
I used part of Stuart277's guntubs to make a gunpit that sits 3mtr high, then compiled separate models of the 13 & 25mm guns that sit 3mtr high, which then allows you to position them over Xaviers/Wolfis piers, giving the impression of quayside flak positions...