In case it helps anyone else who's been having any issues, don't be an idiot like me and have space characters in your folder name that actually holds your UI pieces:
Savok Vert Blue
Seems like it only tried looking in EQ_HOME/uifiles/Savok/ and gave me a bunch of fail messages for XML components that were indeed in the folder already.
After acquiring some intelligence, I renamed it to just Savok, and my interface loads fine. /derp off
The EQ_HOME/uiErrors.txt file was very helpful in trying to figure some things out.