The building isn’t so much the problem as is getting the material.
You need highly specialized equipment, very dangerous chemicals, a lot of electricity, a lot of uranium ore, and a significant amount of time to separate out the U235 needed for just one basic bomb.
A basic gun design will get you in the game, but then you need to figure out how you’re going to deliver the weapon. Dropping it means you need an airforce capable of getting to your enemy whereas missles are more technologically challenging.
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