Ahoy, BH.
I've tried making CWC mod before, but i realized that due to the "bad mechanism" of the game, the CWC settings would always "remain" in your save file, even if you disable it in JSGME. which means in a campaign, if you return from cold waters and go to tropical again, the crew would still have heavy coats and wool caps. Cold weather clothing will exist during the entire career.
I think that's the reason why previous people only made CWC for Alaska campaign. Because it cannot be a JSGME-ready mod and changed by player's will.