Yep, I was looking at it and realized that it'll end up being a great big blob if I'm not careful, though I'd always planned on having the engines above the ship, if they're at the back you won't get to see them and it seemed like a waste of polys for an image like this.
Maybe not go with the extra pod launchers then, bit of a cheat for extra detail...

Though saying that I'm only at 163000 polys, so there's a lot more I can add...