Anyone can make a nuclear bomb

I see... give me 1 year, if I don't come back assume I'm dead.

That's as awesome as it if terrifying.

It's not that hard to make one. The hard part is getting the nuclear material and getting the specifications right to get the maximized explosion. But to make a simple "small" nuclear bomb is not that hard..

That's why they abridged the Mark's Handbook. It used to tell you how to build a nuke

No need to cover single stage nuke building 101- I'll say this, writing the recipe is easy, but creating a wonderful 4 course meal from it takes practice and skill. You need people who can work the complex annealing phases of uranium, who know the characteristics of high explosives, and more. Primitive single stage bombs were massive and heavy. Compact and multistage weapons are much more difficulty to design and create. A single stage ground burst (not dropped from a plane and detonated at a desired altitude) has little advantage to high end conventional explosives currently available but considerable draw backs. A nuclear weapon would be quite destructive still, but not much more so than any random mass tragedy and more effort than other means, to build enough bombs to be a serious threat, in secret, and deploy them, a very difficult task. There is an illogical fear of nuclear weapons. They are big bombs, that's the scary part, not so much the nuclear part.