Well, if you consider I've been working on it all day... maybe not so much. lol
Check out the main impulse engine. In the original design, this was the area I intended to be the impulse, but during the texturing process I turned it into a shuttle bay zone. I reverted back to the original, and now have what I think is a pretty cool looking impulse engine. Reminds me of the tail lights on my '87 T Bird.