I was looking at this for processing, but I noticed you've used a nonstandard compass rose. I need you to replace this with an atlas appropriate one.

The installer should find the data directory automatically during installation. Are you installing the correct version (i.e. the CC3+ version and not the older CC3 one, from your description it sounds like you may be trying to unzip the CC3+ compatible support files for the old tome instead of installing the proper full CC3+ version).

Considering this is a generic underwater style, and not made for a specific setting, I think it is safe to ignore things like breathing, just assume that any DM who is using an underwater style have a way in the system they are using to handle that issue.

Those tools are using hatch style fills. These are separate files that lives in the @Hatch Styles folder. These are regular CC3+ drawings, and you can go in and simply rescale the entities in the fill file.

To avoid messing up the default tool, I highly recommend that you make a copy of the files you wish to change and then modify the copy.

Then, make a copy of the drawing tool in your maps as well (:CC2DRAWTOOLS: -> Advanced), and change the Outline of your copy of the tool to use the new fill you just created.

Looks good. But yea, it's kind of wrongly shaped. The building is also a 3-storey building, so I would expect some visible stairs somewhere going to the other floors, even if not mapped.

Also, since this is an inn, shouldn't there be some kind of reception/bar to find the innkeeper? Or maybe you left it out intentionally.Or maybe I am blind.