Archer decals makes dimensional rivet decals in several scales, and layouts.
I think you want O-scale for 1/48.
http://www.archertransfers.com/They are little resin dots on decal paper,
If you have steady hands, you can use Extra Thick CA, and an teflon tube attachment to place dots of CA as rivets.
I recommend sanding the area, and brushing a bit of kicker onto the surface before application.
I did the 1/24 scale window frames below.
