I am exploring Fabrication for the first time and wanted to know if you must install it over AutoCAD or can it be installed on top of AutoCAD MEP? There are specific deliverable features that I require such as Project Navigator, and it's corresponding annotation features that make MEP a necessary platform for our workflow. 

I have not found much documentation on Fabrication, so if anyone has installed it on top of MEP i'd like to hear if there were any specific issues you had to deal with.

Thanks