Having the same problem I had in this thread but none of the solutions seem to help.
I have tried doing the exact thing as mentioned but my bottom material on exterior wall will not sit down. I'm attaching a picture of the wall and the definition. Any help would be appreciated if you see the problem.
Also you will notice that the solid stone side wall ends show on the front but I would like to have the front wall show all the way across. How do I accomplish this?