I wanted to use this tutorial to learn some basics of IE modding, but this is a very complex topic (not for beginners in my opinion) and it's taking us a lot of effort to clarify the concepts discussed here. I have a lot of mod ideas, but I don't think that these concepts are helpful for the kind of mods I want to create. So I think it's better to leave this area for now and focus on learning the concepts that are relevant for my mod ideas. Maybe I can come back to this tutorial when I have more experience with modding.
Thank you again for all your answers and clarifications.