it also has a z-axis screw that is held at the top and thicker guide rails.

what I mentioned aren't upgrades. just things you will have to do to get the best from a creator x.
My build plate is exactly the same thickness as the original. But as it isn't screwed down with screws that have a different expansion coefficient, it won't warp :-)
And the cooling duct is simply an essential add on, I suppose that one's technically an upgrade :-)