Hi,
Thank you Evgeni for posting those images. Wonderful work!! As Dave Kanger said there are many ways to skin the same cat. I usually use fine silver that is dead soft. However, I used brass wire on the early 17th century gun I built shown below. It worked well but is a bit springy compared with fine silver. Dave's comments largely describe the methods I use. I incise the lines with small wood chisels and gouges, but I also use tiny cutters made from hacksaw blades. These are very small (<2mm) and when the edge is viewed straight on, the cross section is slightly oval shaped. In other words, the ends are rounded a little. That allows me to punch in a tiny curve without the chisel leaving a jagged line.
dave