When EQ2 loads a custom UI, any files NOT included in that UI folder are drawn from the default. So if you don't like a particular window in a set, delete that file and you'll use the default.
And yes EQ2's interface is different than WoW. Apples and oranges. A well-formatted UI is pretty much drag and drop, however. For example, Fetish Nightfall -- if extracted to the proper directory (the main EQ2 directory) it takes care of everything for you.
__________________
|