Technically you can grab any UI and use it but like Miro said you are going to get XML errors until you backtrack the files to 2005. Also add to that even some features available in 2005/6 will be turned off in classic (shared bank etc) even though the client recognises the xml code.
Also, add on to that Project1999 uses custom spellgem layouts to give a more classic feel so you would also need to edit those.
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