Nice work, in some areas I feel there is to much repetition, as in the same material is used for too many parts, I think it would be nice to break these areas up a bit like the air tank.
WIP 13 Further detailing the cannon. Now gonna need to get loose with the noise detail pass and damage details. Need to gather references for those from damaged tanks, etc.
Looks great, things that jump at me are floor boards look a bit smallish, some kind of refractive material on the water tank might be cool, gloves seem a tad too glossy.
Ohh nice to get the such thing.... Tank you... I think the Game of Thrones: A Telltale Games Series http://goo.gl/rS1Gx8 designed in the same way... The Archangel designed in the same way...
try looking up the tank track setup on youtube; it's a combination of spline IK and path constraint. I'm pretty sure there's something in there that keeps every link stay oriented in the correct direction
Just a few of Leonardo da Vinci's innovative war machine designs in hard copy: Tank Flying Machines Machine Gun Robotic Knight Diving Suit Revolving Bridge Parachute