You can try a version of both. Without a lot of research it would appear that you'll needs a lot of straight lines and a series of ends on fenders. A couple of circles on the ends of the gas tank.
Those "lines" are a thin one next to a thick one.
I'm surprised there were no decals for this in the kit; it's a big part of the look.
So, you could draw these with an ink pen on paper at a much larger scale, and then reduce them to the right size for the model. This will clean up the lines considerably. That would be the art to print on clear decal film.