Subject: How many people participate in designing and building a nuclear weapon

 I have read that the design and the built a nuclear weapon is a hard process. 
But I couldn't find information about the people who do this. My questions 
are: How many people participate? What this people have studied? Is true that 
only high level physicist can do it? Is there engineers? What kinf of 
engineers? How many people in USA are working on this? How much time does the 
process take? Where can I find "complete" information about the different 
stages of making nuclear weapons? I'm asking this because almost all the web 
pages that I have read are about what happen inside the atom, not about the 
people who do this.

Re: How many people participate in designing and building a nuclear weapon