I expect the Big U's hull is in very good condition. She was built to Navy standards with a welded hull.
I would be surprised if her funnels are not a part of the rebuild. They are very distinctive and powerful looking.
I just hope they keep the superstructure and just add on to it. I am worried they will cut it away and build anew from the hull up. My hope is that they would just renovate the current superstructure, add a deck or two, and reconfigure the stern with pools. In addition to the interior changes, of course.
This plan would still leave a recognizable classic liner, with modern refinements.
Brent