I didn't make it!
I've noticed that all the assimilated ships that have been posted are for use by the Federation only. After messing with the code, I've begun to see why. The only way to get one of these ships to work successfully as a borg ship is to give it a Borg physics file. The inherent problem with this is that we now have an assimilated Galaxy that strafes when it turns and can fly backwards and sideways like any other Borg ship. Has anyone figured out how to doctor up a physics file that allows a Borg ship to fly normally? The only thing I've found so far is that physics = "smooth" vs physics = "borg" in the craft_physics and craft_borg_physics files, respectively, seems to be the deciding line of code determining how a ship flys (and possibly the throttle-up and crew sounds as well).
The closest I could get was dragonfly/hummingbird effect. In other words if you tried to go up the ship would stay level and go up, so there was no banking. Also AI controlled ships flew backwards. Playing it initially with the modified physics is cool but after awhile it was getting kind of old seeing the ship from the same angle
I ahve looked at some files and it has to be possible there a couple of klingon ships the Ai uses in the singleplayer mission but for the life of me I do not know how the computer differentiates.