Whole stack, one build. Ask for a circuit — "design a full adder" — and a Schematic tab appears. Say "lay it out and fabricate it" and Layout + 3D Fab tabs grow onto the same build. Tab between Verilog, schematic, layout, and the fabricated 3D structure as we iterate. Or ask for a bare structure — "a copper damascene trench, 300 nm wide". Go.