Good morning my friend,
I used a low adherence masking tape, like the ones used for painting interior homes to make lines. They are blue in color. I think a standard masking tape has too much glue and is more difficult to work with.
I used a ruler and sharp hobby knife over a hard surface and cut straight lines, usually 20" long. Then paint them just with acrylics and a brush, I did a second layer with more paint and thinned and lighter shade of same green, on both sides. I did had some trouble with the paint on the sticky side, some of it will peel off. Don't panic.
Then just used as rope, i glued the tip of this "rope" to the back with super glue and regular glue, then I had to tight it using two tweezers one in each hand. This is the tricky part, because both tips are small and you can't use your fingers. This is where some surgical experience is handy, is like making stitches.
Once you have the appropriate length and tied it down and tightly, cut the excess and glue the other side to the back of the part.
As I mentioned if some paint comes off during this process, just use some pigments it will cover the problems, and give it more realistic, used, weared off look.