Sorry for the necropost, but... how do you actually configure that? Technically, you'd have to ignore the "How to Install" FAQs and figure out a way to have all the different interfaces in the Interface/ and WTF/ folders.
I'm on a computer that multiple people usually use, and I'm sure my siblings would be
if they saw the crazy UI and asked me what the hell it was supposed to be. Not to mention the fact that I have multiple characters that I want specialized UI's for.
So, can someone ignore the fact that this post is two years late and tell me how to configure this bullsh*t?