I like it lots!

It's definitely Great War-era Shivan, something to fly alongside Manticores and Shaitans. A little tweakage would help make it fit in more with those and make it less Terran.
Take the two forward mandibles and expand the ends, so they look more like the arms on the Manticore or Scorpion. Add a couple spiky fins, swept forward or backward, like the ones on the Shaitan or Dragon. Then make the engine a solid red, add some silvery light-gray detailing, and voila.

Or you can leave it as-is and make it a very early Terran-Shivan hybrid craft. Woolie Wool might be interested in it.