Thought I was over b5 but obviously not!
I've put together a mod that is hopefully neat enough for anyone interested to enjoy. The main priority was to have the ai using the extra models but still keep user ship designs intact. All the material used can be found in the metaverse library - all I've done is rename lots of models and edit lots of ship configs. If I can't work out decent names for all the stars and planets I reckon some should be called Coplann, Vorlone and Robalis. The file at the bottom contains all of the currently released models - about 40.
I was a victim of the 'one more turn' bug and there are heaps of things I've already fixed in the time it's taken me to find somewhere to upload a copy.... anyhow....
Earth Alliance, terran ai and hull style
Centauri Republic, drengin ai and hull style
Minbari Federation, altarian ai and hull style
Vorlon Empire, iconian ai and torian hull style
Shadows, thalan ai and yor hull style
The only one I significantly tweaked the alignment for was the Shadows. Here are some screenshots to try and justify the 20mb download.

Centauri getting frisky.

Battlecrab behind you!

Ahem.

Earth Alliance guarding Vorlon freigters.
Known issues:
-the logos don't have a transparent background
-the minbari need more ships (using the Vree Xill as their cargo and the Brakiri Cruiser as their large)
-some of the ai designed ships have annoyingly placed jewelery
-lots of things, this is a beta mod for a beta patch
I'm sure there are already easier ways to do this and the next patch will probably break everything, but for anyone keen: Link
New version - test 2
Download and screenshot further down the thread.
EDIT: removed two oversized screenshots and corrected some spelling.
EDIT: new version