Could you please add an option to "Enable friendly building damage" in the mod settings? I know it's off because it's easy to hit your own buildings. Being able to hit your own buildings would make the invasion damage more realistic（like while insects are biting a building, you might accidentally shoot at the building that is being attacked）. Alternatively, could allow damage to taller buildings. Short buildings like pipes, walls are immune to damage. By the way, I really like this mod.

Unfortunately, military buildings in factorio occupy the same collision layer as regular buildings. This means that if I enabled friendly damage, it would damage all buildings, including preventing turrets from shooting over walls. The only way to fix this is to add a new collision layer, which unfortunately would hurt compatibility with other mods. If I find a safe way to do that, adding that feature is something I would consider.