I've done rivets on Mylar before. I melted them on. I used a soldering iron and brass tubing. Oh, and a dimmer switch to get the temperature correct. Works great. They have been on my ercoupe for 5 years now and they don't rub off.

To achieve panel lines, I masked various panels and then scuffed them with a scotch brite pad. The contrasting grain of various panels implied the panel lines. This worked great with chrome monokote, but I don't think it would work with any other color.