My question is: how do we replace nature flat archives and control the size of the flats? Do we need to provide a new texture atlas for that to work?
Well, the mod is out now so I guess I've answered my own questions. I have one more though:
When Daggerfall Unity is creating the texture atlas for nature flats, it reads the classic image data, then checks for texture replacements and loads those if there are any. However, it still forces the image dimensions of the classic DF data in the size array for the atlas. Is there a reason for doing it that way instead of having the texture replacements use XML like they normally do?