While in El Salvador for an extended period of time, I decided to enhance my local wargaming terrain. After a day of raiding the local stores, I came up with the required materials.
I'm scaling the buildings to work with 28mm sci-fi and fantasy miniatures. Here, I've got the start for a two-story building.
I cut out the four sides for the building, using cork tiles from local office-supply store.
I then place masking tape on the faces of the ends, so I can secure them to the sides while the glue dries.
Here, I apply a liberal amount of extra-thick white glue to the connecting portions of the walls.
Then, I start connecting the pieces and securing with the tape straps for drying. I also place a nice thick run of glue down the inner seam to help reinforce the structure. Note the newspaper to allow glue to pool on inner portion of walls, and thus make the joints even stronger.
Sides all taped up and ready to dry.
Here is a nice two-story example, compared to the figures.
Once the building shells are dry and sturdy, I basecoat with black acrylic paint; and once that is dry, I follow up with drybrushing. This structure got shades of gray (or white if you will).
I then made a roof out of corrugated cardstock, and hit that with some brown to help break it up a little. Here, you can see the structure amongst all the other local-purchased and scratchbuilt terrain.