Clawcrafts have been rendered that way for several years. Check around. They images for the clawcrafts were in circulation before the Tri-Fighter came about. The first mention of the Clawcrafts was in the Dark Tide series released in 2000 where as the first mention of the Tri-Fighters came in the book "Jedi Trial" which came out in 2004.
The empire and that's about it.
The tri-fighter was an attempt to bridge the style gap between the movies.
The claw craft was an attempt to show the influences of imperial technology combined with the ingenuity of the Chiss.