Of the four plans modeled there are really only two I would ever consider building.
This is one of them. At least in this shelter you can stand up and move around somewhat.
Of course you have to have a basement in which to build the thing though. Like the other models this
one also has it's own boxed cover for it. The Civil Defense
film - SHELTER ON A QUIET STREET shows the construction of this type of shelter.
Click Photos To See Larger and PDF File of shelter plan can be downloaded by clicking link at bottom of page.