It took about 8 tons of gravel to do the east side and the drainage into the front yard.
Which means it took about 15 tons of gravel to fill things so far.
We moved it all by hand. In two days. Please be impressed.
These are pics of the drainage from the house into the yard. Luckily there's a good slope down to the road from the house, so the moats got much shallower and faster to fill as we moved forward. We thank heaven for small favors.