Hi Joe,

Yes I've dealt with similar circumstances fairly often...Feel free to share my contact into with them, if you wish. Its not that hard to do, even for inexperience General Contractors to "cap" there concrete footings with real stone and meet local building code requirements. Its becoming more and more common to employ real stone this way.

Being here in the East, they could just use granite 8"x8"x8' post and set those into their intended excavation.

The other options is a split natural erratic and cap the 8" concrete tube footing with these. They can either "scribe to stone" or shoot laser layout and make flat. Its less than a 3 hour for the "live edge" and 1 hour for the flattening for your sized building...

There are several "stone plinth" solutions to this challenge...

Let me know?

j