Which part are you referring to - the gray fiberglass framework?
Once you fully undress the front of the Y50, the front profile will look like a "U" with a rather thin metal bottom that I wouldn't consider a true radiator support.
If you have a picture of the car in its current stage, that will help us move forward.
https://forums.nicoclub.com/how-to-post ... 18411.html
But yeah, everything can be unbolted save for that welded bar that makes the bottom of the "U"... without compromising the bottom support.