Wow a modder that has barely seen the theme he is currently modding...now I'm going to need a few too many.
Doesn't matter that much, the Red ship is the Vorlon Destroyer, seen mostly in background fleet shots and briefly up close in the movie Thirdspace.
But if you need references for Vorlon ships or any others, these sketches may be useful.
http://www.wolfsshipyard.mystarship.com/drawings.html
Just my recommendation though, stick towards the stuff labeled canon...those are the ships from the series and the B5 Wars game...the completely non-canon ones may have a couple of interesting ones but ultimately they look like massive kitbashes on steroids, particularly in the EA non-canon Groups. The ship size charts have some good side shots of the official ships of most races so that might give you an idea of what to search for inside the race sections.