This paneled wall that hides the cabinet backs will support a pine bar top (still working on that, though). The opening on the left provides access to the utility lines that come up through the slab under the cabinets).
I also finished the ceiling by attaching drywall to the subfloor in each joist bay, leaving the timbers exposed from below. We painted it with Bioshield clay paint to match the walls. Time to build some countertops!