@mmat - yes, it uses the same scheme. i modified one of the tile entries in the coastline tileset to mimic what i found in ttr01, but as i mention in the first post of this thread, it didn’t work.
here’s an example of the problem :
you’re probably already familiar w/the stream connector on the bottom [ttr01_g11_1] ; it comes with the rural tileset. the yellow circles show the tiles from the coastline tileset that i’d like to be able to accept a stream. as you can see, it’s also impossible to make the ‘shallows’ tiles go all the way down to the water, intervening rural tiles are required.
i tried a similar approach with the forest tileset, but i don’t have anything to illustrate because i no longer have the hak… 