Funny enough I just came on to post a similar question. The tileset looks absolutely amazing, however I also want to use automap but some of the tiles don't work too well with it.
It may be a case where I'm not using the correct tileset for my use case, but I can't seem to find anything in all of the files. It seems like there aren't many defined inverse corners (for creating 'blank spaces') or tiles for "weird" corners.
I found an inverse tileset in the Legacy folders, but unfortunately those tiles don't match the ones for the Rural village...
I can message you with examples of the corners/tiles if it would help give a better understanding.