I'm not a thelemite nor a practical magician, my interest is merely theoretical, but I think that Crowley most definitely experienced a great deal of what he transmitted. His battle with Choronzon was most likely made up to terrify his companion, but I think Aiwass was real.

He experimented with mescaline along with a plethora of other psychoactive substances, as is the magical /visionary tradition. If you haven't, check out the correspondences in 777, lists of plants and drugs pertaining to the sephiroth are given . I want to say mescaline is geburah-yikes!