You'll have copy not only the tradeskill window from Fetish, but also all the supporting Fetish style files.
Namely this will be adding <include>_FetishStyles.xml</include> to your eq2ui.xml file in your profit folder, and then copying that file from the Fetish zip into your profit folder. You may also have to copy the fonts <include>'d in that file (namely FontArial14T.xml, Font_Euro_Arial14T.xml, and Font_Japan_Arial14T.xml although realistically you should probably need only the first) if profit does not already have them.
So, in short:
Add <include>_FetishStyles.xml</include> to eq2ui.xml
Copy eq2ui_tradeskills.xml, _FetishStyles.xml, and FontArial14T.xml from the Fetish zip to your profit install.
At no point do you edit eq2.ini. The game loads one custom UI only, so adding multiple references in there (which sounds like what you tried to do) just ignores all but the one).
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