Nice tank! You might make the base thicker, but it also depends on how large it is in comparison to a person.
Quote: "Symbols to put on the sides perhaps? "
Camo colors with some vents or seam grooves? Flag for the owner's alliance, maybe some skulls for 'kill counts'. Serial numbers?
Quote: "(I probably won't animate the treads, I'm kinda new to animation and don't want to try something too complex) "
You could always separate the treads from the tank, and scroll a texture of treads in the appropriate direction.
There's something in this room that makes you can't speak well.