So, what's the value proposition of something so enormously more expensive then building on earth?
Maybe a colony on another planet or something... I don't see it being useful on Earth anywhere though without crushing the ever-living hell out of roads it crosses. Although I imagine it has auto-leveling capabilities and could probably lift up or at least lighten its footprint on whatever tank segment is over a road bed to prevent excessive damage when crossing.
A mining and refining and manufacturing station all in one on Mars, for instance. A gigantic RepRap manned with a crew of tens of thousands, complete with what appears to be an airport runway and could be equipped with a space launch facility.
But the same mission could probably be accomplished more inexpensively by trucking raw materials to a central refining and processing facility.
I guess the value would be sociological rather than material: If you want to build a roving metropolis-colony rather than the current socio-economic model of industrial centers and rural resource gatherers.
