T.F.
We put in flagstone walkways around our house. My husband was super picky and we had the area dug out, laid DG as the foundation so they wouldn't move, laid the flagstone in the patterns we liked, then covered with DG again and washed to settle it.
SO far is has held up well. We don't have it set out specifically for drainage. We have underground drains that flow out to the back of our yard which is park property.
Your ideas sound nice and attractive!