Western General Store - slats and roof
Here's an example of how walls have been built. If you look closely on original pictures you can also see 2 x 2 top hinge piece (marked in Yellow here) used for attaching it on the bottom.

Roof is, however, not connected to the top edge. This is how top edge looks on one side of the roof as it is made out of Technic pieces, mostly:

Parts are:

4623a or 4623b - Plate, Modified 1 x 2 with Bar Arm Up (Horizontal Arm 5mm or 6mm)
32013 - Technic, Axle and Pin Connector Angled #1
62462 - Technic, Pin Connector Round 2L with Slot (Pin Joiner Round)
2780 - Technic, Pin with Friction Ridges Lengthwise, Staggered, with or without Center Slots

Each of two roof surfaces are not attached to the top edge as I mentioned, however each cylindrical portion of the roof is attached to studded plates with the help of Plate, Modified 1 x 1 with Light Attachment - Thick Ring. Pictures don't tell how these are attached together. Keeping in mind we have plates visible, it shouldn't be hard to create some sort of structure underneath top surface to hold each &quot;plate+cylinder&quot; assembly together.