This is less a question to the developers of Unity and Canonical than a question about Ubuntu itself so please excuse me if this question doesn't belong on this site.
While the question seems to speak for itself, maybe the word install script is a little abstract; I'm talking about a script which not only checks for the required dependencies but also patches gnome libraries and such.
As a programmer, I know this is a lot of work and I can't ask the Ubuntu developers to spend their time on other distributions but, in the case that an install script is entirely impossible, there should at least be a document with guidelines on how to install Unity, patch Gnome and what is required to take the necessary steps.