Work in progress on the destroyed houses, the top three pictures show the "L" shaped bases with the foam board sections cut out and in position, ready to be cut to shape. Creating smooth rounded shapes which can then have rubble built up on them. Along side the "L" shaped main sections are the rubble section bases. One of the houses has a 2p size section cut out which will be used as a dug out. The other two will also have dug outs cut into them. Which when not in use can have the plugs replaced, covering up the dug out holes.
The bottom picture shows the first three stages of constructing the rubble bases, the top one still needs the small grit adding.