I've extended the Roofs_01-05 and walls exterior_roofs01-09 to fill out the lower roofs including those that didn't have any.
The new files have "_extension" added to the end so you'll have to update Tilesets.txt to see them in the editor. Ive include a txt with the code snippets in the file below.
(question for devs, some of the tiles displays a lot of white tiles at the bottom? and I don't know how to fix it.)
Download