If you just want it to work, only include the files that you're changing. Any files it doesn't find are automatically pulled from default.
If you want it to show up properly in /loadui (which is still buggy, fwiw) when not using any other custom UI, you need to include an eq2ui_skininfo.xml. You can copy it from default and just change the name and such in the data tag to whatever you like.
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