@trademark @bsdphk Not only are they well within capabilities, most of the knowledge you need is well documented. The N-th country experiment was already an eye opener. Today, 60 years later, it's much much worse. It is so easy to get access to scientific documentation than it was just a decade or two ago. There are youtube channels that discuss advanced nuclear physics. There are tons of videos of nuclear facilities, both civilian and military.

The only thing hard to get is Uranium/Plutonium.