It would appear that Jan hasn't been online since March 2023, so it's quite possible he won't reply...
Looking at the photos, I would assume a very small brush, possibly taping off the section... you could use a sharpie, especially for the "dots"
The details you got on the body, interior and engine really knock this out.
It looks very very similar to one I've seen at car shows around here.
While the color and vinyl top are not really my thing, this is a very sweet build.
Very nicely done