Survival in the Nuclear Age has information on shelters, doors and hatches for shelters and other good information. It may come in handy for someone, depending on their level of involvement.
Offered by Clipper.
We have been helping people to build shelters for the past ten years and average one completed shelter a month. We currently have five shelters in various stages of construction. Several different structural materials were considered when researching shelter construction. Consideration was made for construction from concrete, fiberglass, wood, old tires, and steel. The blast shelters constructed from steel plate and corrugated steel appear to be the least expensive and most easily constructed. However, we have done some concrete shelters.