Invasion is probably best canon for the Kafer Invasion fleets (there were 3), Kafer Sourcebook has some seriously cool background info as well to help with the er mindset? half mindset? er Kaferishness. Actually one of the secrets in the Sourcebook would work really well in an Aurora version of Kafers. Plus they are really the implacable, almost impossible to understand foes harkening back to the Arachnoids that you dealt with in the olden days.
as above Etranger is pretty good for everything 2300, though not crunchy for obvious copyright reasons
pity Aurora combat isn't quite the hide and seek with Bazooka's that Star Cruiser was
though it's certainly closer than anything else I've seen.
Uh oh, my 2300 trigger has flipped, I'm gone now!
heh unfound warp points work as the backdoors into and out of Human/Kafer Space!
incidentally I loved what you did with the Eben, so very much like the Eber, even down to the colonising of their homeworld!