From the screenshot, all this seems to be doing is running an X server, so it should be trivial to switch from Unity to i3, Xmonad or whatever. The next level

From the screenshot, all this seems to be doing is running an X server, so it should be trivial to switch from Unity to i3, Xmonad or whatever. The next level of integration would be running X11 fullscreen and then launching Windows programs inside that environment. e.g. Word 2016 launched and managed from the Unity launcher.