Barry, here are a couple of pictures of my sink base for the same sink. The sink is supported by the recessed edge along its perimeter, which is plenty strong enough to support it. In one picture I propped the sink up with a tape measure so you can see the underlying plywood, which is supported by a 2x4 frame. If I did it over I would build in shelves and tray racks underneath. In the sink is a sheet of plexiglass because I didn't care for the large ridges built into the sink.
I will email you several more detailed pictures.