So you already ported it? And there is a problem with your mod structure: The campaign installer in the SAI/options folder overwrite im,portant files, so you have to port it for every campaign...
I made custom battles work, but now the campaign doesn't work.
Here is a link where it is explained how to make custom battles work:
http://www.twcenter.net/forums/showthread.php?t=263469
But I have to say that in my opinion, the BI engine fits your mod better than Alex.
By the way: Your mod is one of the greatsest total war experiences. To play the whole empire, the offices, ethnic traits, the named and numbered legions, and so on. Great work! +rep