I stumbled onto this thread on Reddit, but while the question is really interesting none of the answers is of much help.
Has anybody tried installing it in Freya?
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It seems like it does not work anymore.
This is possible in Luna but you can't do it in Freya because it depends on super-wingpanel: http://ubuntuhandbook.org/index.php/2014/01/global-menu-elementaryos-luna/ The dev for super-wingpanel abandoned it so it won't run in Freya. SeriouslyLaughing - On the reddit thread you've posted.
But the only way to be sure is to try it yourself. You could create a virtual machine with elementary OS to test it with, that way you don't harm your system.