Well, it rather resembles the Renault FT, a French tank of the WWI period, which had only a two-man crew. It was basically the first ever "modern" tank (engine at the back, crew at the front, turret on top), and it stayed in service until the beginning of WWII.
Yep. I tend to look at a lot of real world gear and then draw something new from my mind. The large runner weels are certainly remonicent of the christie suspension. I actually like the look of more archaic or coplex systems but this style is certainly easier to draw.