Originally posted by Ryx
I'll see what I can do with tail. 
Those hangar tuber, or whatever, are going to be problematic. I'm not keen on messing up that bit of geometry.
Just make them circular (or rather smoother), and then draw a large indent on the top.
i.e. so
/--\_/--\
| |
\__/-\_/
(sort of; i.e. the indent the top bit to get more of a 'box' feel, and also to break up the otherwise repetitive and obvious 'cylinder!' nature of it with some nice texture and depth variation.
EDIT; bugger it. Imagine a hexagon. Then imagine the top and bottom bits having been depressed a smidge. Then imagine the other sides, having had faces added to be smooth and curved.
I'd agree with narrowing the back flares. Also, I think you should have a peek at what you can do with the 'belly' of it.