Tony, I'll preface my remarks by admitting to knowing absolutely nothing.
However, here near the sand hills of Nebraska, they built a new nine in 1997 on ground that was a mix of sand, silt, and, old Platte River rocks. They clearly underestimated the need to improve the sub-grade, as today, the super has problems problems problems.
I've asked him about trying to add organics into the profile but he seems to think that won't do much, implying it all needed to be done before the nine holes were finished.
So, it's my attempt to warn you about the approach you seem to want to take to build a golf course. (If that is your premise)