Have you read the books? Dan Abnett's description of their uniforms doesn't quite square with artwork and 'Eavy Metal paint jobs. I have to admit, I prefer the artist's style. But I love that the book has them using halftracks, attack cycles and the odd non-Chimera APC.
I gotta find a way to make cheap and decent conversions of those guys, and represent them in the current rules. I once heavily converted Catachans. Kitted them out, shaved the arms down, added hair and gave them shin puttees. They still stood out a bunch. Wish Forge World would give them a little love.
Darndest thing is, I can't field all the characters. There's no point where all the heroes and major supporting characters from the books are together.