OK, I fought with the converter a bit more and got it to actually convert a couple of basic mods. It apparently does spit out error files, but they're in a weird directory.
In the Converter, when you convert, under the XML Layout Reports (the biggest wall of text for me), under StoryWnd I got an error message "Error during HTML beautifying step. See details in C:\Users\Public\AppData\Local\Temp\StoryWnd_errors .txt"
Looking in the text file, it listed:
line 24 column 1 - Error: <eq-vertical-layout> is not recognized! Did you mean to enable the custom-tags option?
line 24 column 1 - Warning: discarding unexpected <eq-vertical-layout>
line 45 column 1 - Warning: discarding unexpected </eq-vertical-layout>
This document has errors that must be fixed before
using HTML Tidy to generate a tidied up version.
I had added a vertical layoutbox and shoved the listbox and stmlbox in it and it's reporting a false error.
When I did a:
/loadskin UiName 1
in EQ, it loaded fine.
I'll have to play more with it later though, it's time for me to go heal hooligans on a raid.
