Continuing.
How to use the transparent lines tilesets:
Start with the 100% tileset to build your level/screen. The tiles are in exact same positions across the versions, so once you are done, you can switch the tileset within the screen to a transparent version and the structures remain intact, but turn transparent or even invisible!
You can use them to build a level around a background image if you like, or make a very ethereal-feeling screen.