The next issue for me are cliff tiles. There doesn't seem to be a list of cliff tiles to be used on the cloth map.
So far it looks like they are autogenerated from the 3D tiles which would umm... suck. That would mean that there is no way to mark them as impassable terrain, like mountains are visibly marked.
Moving units along the coast can be infuriating because you have to keep trying squares until one "works" and the unit finally starts moving.
Submerged terrain is equally bad. Some of these squares look like solid ground on the cloth map but are technically water.
Elemental\Gfx\Cliffs\cliff_transition_*.png is not it. That's only for the 3D map, where cliff / submerged tiles can always be told from "real" terrain - because the grid overlay is not displayed for them.
I just want a fully useable cloth map. Then the 3D map can go to hell.
Hmm. In a so-what-it-cannot-get-worse test I removed both "cliffs" folders from the Elemental path. And I finally got a reaction from the game. (not a crash = )
(actually, only removing / renaming \Elemental\Gfx\HKB\Cliffs is sufficient)

As you can see, cliffs are now visible at a glance from the cloth map. Not bad for a crash test...
The ones on the right are submerged tiles.
So something in either of these 2 folders does make them tick. It's a start.
And ya know... it just keeps getting better.

You see those 3 tiles that break the pattern? That's a beach. Visible from the cloth map.
That's an entirely new feature! How cool is that?