That seems like a lot of work. If what you want is to be able to run MacOS X apps on a free (like in free speech) environment, there's https://www.darlinghq.org/ which is like Wine but for MacOs X apps.
If what you want is to replicate the MacOS X UI you can customize the UI of your DE on Linux, or use something like ElementaryOS or use Pantheon.
What are the goals of this project?
Cool. What kind of GUI apps work ? The FAQ doesn't say much except basic.
Could we use Mac compatible apps in place of windows ones if Linux isn't available? Games? Productivity?
From their GitHub page[0]: "Please note that most GUI applications will not run at the moment."