I haven't yet figured out how to attach the cover scale, maybe a thumbscrew or cap screw, which can be undone so the scale can be swung aside to expose the compartment. I would like it to be tool-less so that carrying an Allen wrench would not be necessary to get at the contents. Another possibility might be to replace the eyeglass screwdriver bit with a hex wrench.
If I were to make this mod, the scales and compartment would most likely be made of aluminum. I'm not entirely convinced this would at all useful so I may be sidelining it for now.