btw GC2 accepts comprimated binary X-Files. that reduced the size from 18,7 MB from my Sharlin Cruiser down to 5 MB. Which is still pretty big but way better than 18 MB for download purpose. didnt see a difference to a text X-File ingame.
link works now thanks.
Iam still looking for lower poly models to use so I dont have to make them myself (not enough time on my hands), but it seems most sites that had babylon 5 models for modding purpose are closed down now.
found a site that has lots of Babylon 5 models for Blender ( http://www.b5-blender.com ) , but 3DS Max doesnt accept 3ds Files exported via Blender for me at least.