How do they define 'bodywork'? My Superbeetle will mostly clear 3 1/2", but there is a front tow hook on the right that is at 2 7/8". The law whereabouts is no lower than the wheel rim, and I have front tires with a 2 1/2" sidewall.
Most people think it's low, but it's not hoodride low.
I would think in Australia it would be important to look imposing, what with road-trains, Mad Max and all.
Polished steel, even if it's only a beaten skin over the donor bumper. You could go with a step in the center for extra clearance for gravel roads, or widen it until the outer sections are a spat over the front wheelwells. Seven 2" round holes at the stagnation point.
Drop it, then size the airdam. Satin clear Plastidip for low maintenace.