Hi Rafael, welcome to the site. Have you seen John Glover's "Aircraft Shapes" video? In it he builds a nose for an Aeronca Champ, not exactly a Chief, but not too far off in the skillset used. I have seen the vid several times actually, what the camera quality lacks is made up in the wealth of knowledge presented.
Here's one place to buy a copy:
http://www.metalcrafttools.com/video.html or maybe borrow one from a Fellow EAA member?