My plan for my Buick is a street-strip car. Fireball drag radials, headers, Forward Resin Daisy mags. Nothing too outlandish, just a healthy, lightly updated musclecar. I do believe there are some vinyl top tutorials around on the internet. I'm sure one of them would list the size of styrene strip needed for trim. Perhaps flat black paint sprayed from a distance would work for you instead of the fabric. You could just leave the seam line and forget about it. We don't want it going back in the box unfinished again.