Hardcore Modelling Challenge: Building a Gears LAV Tank.

For my latest adventure with 3DS Max and VRay I've decided to enter a competition on CGSociety tasked with creating an iconic vehicle from Game, TV or film and posting my WIP feed.
I have chosen to create a LAV tank based on my love of games and influence from Gears of War. I aim to create an asset which fits into the Gears of War world space by attempting to copy Epic Games artistic style.
I've managed to get the majority of the body blocked out and I've started to model the turret in extra detail. let me know what you think?

Fig.1 The model so far...

Fig.2 The Aerial Orthographic