As the title suggests, I would like to know if it would be legal under Australian law, I am not too sure about the law and Halftracks.
I would also like to add, this vehicle is capable of the speeds you would see commonly in most suburbs of Australia, it's just not capable of highway speeds, though the road layouts would allow for you to navigate without the use of freeways, it has a theoretical speed of 76 km/h provided by an Inline-Six, 4.17 liter Maybach HL 42 TKRM engine that can output 74 kW, which powers the rear track assembly.
Though going highspeed over bumps would not be comfortable at high speed, as the rear suspension is provided by torsion bars and don't serve to absorb shock, while the front axles are tended to by Leaf Springs, which again would not be too comfortable.
Also, would and Sd.kfz 222 be legal too? This vehicle unlike the above does have four wheels, 3.8 Liter Horch V8 Petrol and weighs in at around 5 metric tons.