Hi Swen! That was an old tutorial that explained how to use the wall borders! Now things have changed cause all you need to do to create a room is using the "Room_Builder" file, so the "how-to-walls" file has been removed! I suggest you to update the pack for free, since you already bought it 20 days ago ;)
Viewing post in Modern Interiors - RPG Tileset [16X16] comments
After going through the "Room_Builder" file quite thoroughly I'm a bit confused. There seems to be some parts missing in some of the room borders/ceilings. How would I go about recreating what's in the 2nd example image (on the right) with one of the 3 wood borders? That protruding wall at the top (between the plant and the radiator) seem to need a ceiling piece that does not exist in the wood ones. Am I missing/misunderstanding something or is that just how it is? Thanks in advance.