This map should help people who want to make adjustments to buildings, like changing the sizes of footprints and obstructions or changing the foundation or rubble art -- or figuring out if new art is needed.
It displays all buildings from the structure directory, along with foundations and halfway-completed foundations. You can delete a building to look at its rubble. You can open the developer overlay (alt-d) to enable the obstruction and bounding box overlays.
The code was largely copied from "Units demo". Elexis added the selection highlight.