Using Scene Assembly in Maya out of the box is very complicated. There is currently only Pipe Assembly Manager in Maya Bonus Tools to help dealing with the setup of Scene Assembly, but it's broken for OSX and Linux.
Here is my take on making Scene Assembly usable. We already used it in production several times and it has been a great helper.
I decided to make it available to the public but only on request and without any promised support. If you are interested, let me know.

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