Dragon- I think that should work. I would make two points with pencil lightly and line up the ruler to connect the dots. That's if I were to use the stylus, but I would rather just fold to make the creases.
I folded the bottom half of my ryu jin. I haven't shaped it yet, I'm waiting until I do the top half.
Here are the progress pictures.
Transition units done:
Legs done:
Scales done:
Scales wrapped around body with the legs coming out of the back:

One issue that I'm having is that when I try to curve the body, a section of the scales buckle out. You can see it in the last picture a couple inches behind the legs. Will it go away after I wet fold? And my wet folding is dampening my finger with water and rubbing it on the thicker layers that needs to be wet folded. I think that kind of method will remotely work.