When you create a region in the custom Panels layout, you have an option to add a custom CSS class. A value entered here is saved with the Panel, but the rendered output doesn't include the class. The Aurora docs mention using
hook_aurora_layout_attributes_alter() to add attributes, which is fine, but without this custom class, you must rely on the internally generated IDs (main-row, 1, 2, etc.) to reference the regions so that you can add the attributes. This seems a little ambiguous and I have concerns about it working consistently in all cases. Are these concerns valid and/or is there a more proper way to reference the regions individually so that they can be assigned to specific grids?