Hi Ed,
The rivets would be as prominent as the butt strap image you posted, so it is really your choice if it were me then i would show them.
Two methods of doing this are,
1, when making the plates out of litho plate emboss the back edges of them with the rivet patterns and glue into place.
2, using a fine needle syringe filled with a slow setting adhesive, either PVA or a very slow cure epoxy dab the needle tip along the pre marked lines on your plating and leave to set overnight. If you mess up these, just wipe off and have another go.
Cheers
Ian