Nuclear Proliferation and the "Nth Country Experiment"
nsarchive.gwu.edu
nsarchive.gwu.edu
And here is a recipe for a cookie with plutonium filling in a beryllium tamper...
But the deliver system is a whole different story. Missiles and jet engines are much more difficult to develop from scratch.
That’s why non-proliferation focuses on preventing countries from enriching Uranium and preventing countries from developing rocket booster technology.