Personally I would have scrapped the tracks and huge cannon and turned it into a spaceship. Looks too pristine to be a tank. It's huge! In any case I think this still looks amazing, very nice use of curved pieces for the outer surfaces.
Wow. That is massive! I really like it, all of it! And like the cock pit is awesome. However, it looks like it would be better as a science lab on a foreign planet or an explanation vehicle. The half moon front makes it incerdibly exposed, and I wouldn't want to sit that far front in a battle. It does look impressive even if it rides really low. I don't know what the inside looks like but one thing I found about tanks with their guns at the back of the tank is that the tank is 90% exposed before it shoots.