So I was in a mp game last night and decided to see if an orky could jump between stars. Turns out they can but to cut down on mass they loose their hull and obviously crew 
Phase jumping a Vasari Rebel Starbase between stars results in the following.
1. hull model and textures are removed, all that is left is the particle animations for the innards and venting? of the starbase
2. phase lane animation is the size provided for a frigate, not the super sized particle effect used when jumping between planets.
I have a screen shot of it I'll put up tonight when I'm back on that machine...