Aha! I looked in to see if you had spotted my tutorial article on this topic and you have! Thank you, Don.
I also do the curving that Yu shows so nicely in that wonderful drawing! I didn't put it into the original article since I was aiming at a sort of basic description.
What do people think about my preference NOT to use joining strips while building cowlings? There are places where I will use them - like fuselages, if they are designed well (Halinski, GPM, etc.) but generally do not like flaps or strips.