Finally, the doc is out. It should be improved now, it’s not finished! Pango, Localization, Accesibility and some HIG tips would be good starts. Do you want to try? It’s a good way to start GNOME hacking, first meeting with high level Python, then deep into C, with some GTK+ and GNOME concepts well-learned :D. I’m sure you cannot say no. Your mind is telling you “why not? Let’s try”.