Building on crushed a’a

[Schoolmaster]

Guess I should have chosen my words more careful.
I didn’t mean cinder, but rather the grey 3/4” like I used for the full and driveway I have here.

Now, would I need a truckload to fill the whole building area or would I just level out the places for the pier blocks?
I think I’m more curious than anything. Not sure if I’d build on here the more I think about it. But I’ve always wondered.