Wow. Just read the whole thing - very unnerving. One of my shirt sleeves unrolled itself while I was reading, and the moment I felt it I jumped up thinking it was the assassin! :ahhh:
I'm wondering if this does indeed exist? Some parts sound very believable, whilst at the same time I'm pretty sure the Construction Set alone isn't capable of doing much of what is described. It'd probably have to be a complete executable rewrite, as is usually the case with creepypasta stories.
That way, I could try running it as an executable directly. However, since it's never covered in the original recording of the effects of the mod, I don't want to risk losing my computer to an adverse reaction. A defense mechanism, if you will, to stop us from finding out more that could seriously damage my computer.
Maybe you could use http://www.sandboxie.com/ to try and run it within a contained environment? I don't want to come off as aggressive here, but claiming that the mod exists and that you intend to run it only to then hesitating in doing so just makes the whole thing less believable.