This is nice, but probably way too expensive. Why not just put up a pile of bricks? :) I like the use of a floating frame on screw piles. I think NZ needs something like this, since it is truly impossible to put something safe up on their muck. Standard materials, such as drywall and concrete would require more piles and a heavier frame.
If the foundation is moderately decent, then I would go with integrated foam concrete forms on a pile base. The roof should be steel. I once liked concrete dome houses, but those have a very poor living density.