Want to see some pics of people who painted the roofs on swingers a different color from the body, Im thinking of shooting the roof of my sublime 74 swinger black to make it look like a vinyl top.
You could lay down a 1/4-3/8" vinyl strip or tape out and pinstripe to separate the two. Neutral colors help break up hard transitions like that. It's a little more work but it would look cool.
I think the chrome trim is going to be the easiest thing to do to separate the two colors. And, if the goal is for the painted top to mimic a vinyl roof, it would look more like it if it had the chrome.