Except for the freeze protection, that is how they have built houses here for decades. In places where they only need a few feet to comply they just truck in enough dirt to get up to FEMA. Back in the good times, there were more dump trucks on the road than cars at some times of day.
The neighborhood my wife brought out of the ground had 3 feet of dirt trucked in before they started building and then the house was built on a 5 block stem wall above that.
The W/H and HVAC was on a 5 block platform too.
There was a big debate about whether the pool equipment should be elevated too but they decided in stayed at grade.
