Credit goes to zel, not me. I simply have plans to improve his mod, but he did the hard work. The original link is gone, so I reuploaded it here:
http://www.filedropper.com/destructiblefactoryv2b
You will get a destructible factory and oil tank model. If you're savvy with S3ditor you can add a sensor so that, if you approach within visual range of the buildings, you can be reported to hostile forces.
