You know this mod hasn't been updated right? Before Summer patch, modtools didn't exist, so adding custom graphics was impossible. Fishery will look like a Harbor, Cantina Quarter will look like a Commercial Hub and so on. Without modding tools, the custom districts had to be based on existing districts and then were modified from thereon out.
Now the tools are out, so custom graphics would be possible. But that doesn't mean this mod will get them - Not everyone is able to make new graphics from scratch. I'd just wish the mod was updated so that it would work properly with Australia patch, as according to a poster above, it does not work properly in the new patch.