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It really didn't have to be perfect, nor terribly intricate because the Media went along willingly. Took about an hour after the WTC attacks for the name bin Laden to be announced, courtesy of Israeli Intelligence.
The public, at least here in the US, bought it instantly. If there were any holes in the official version, they were poked only on the internet, and only in these corners of it, where "decent citizens" do not venture.