Here's the bracket being riveted to the inside edge of the airframe. It is better for any overhang to be located inside the outline of the airframe as it makes handling, storage and transport that much easier. Be careful not to let the drill-bit impinge on the other side of the extrusion, however, as it is likely to crack and need patching. New material requires new methods but are worth the love and tenderness in the end; for example the new generation of airline cabins are a plastic composite and as a result are lighter and stronger ~ this in turn reduces fuel usage and provides a more comfortable cabin pressurised to a lower altitude.
