Does it necessarily have to be a 30040/41 combination? They will eventually be able to publish wiki pages, too right, or a 30040 that contains a wiki page or another 30040. So they need to be able to define which kind each section should have, with 30040/30041 simply the default.

I'm just thinking that it might make sense to go full modularity in the design, from the start. Also probably need to put a help text above the editing field, that explains where you will define a split. Like, what happens with the content in the preamble? Does it go into a summary tag or does it get a preamble 30041? Is the header where you type in stuff that will end up in optional tags? Which tags will you process and how do they need to type them in? Can they see that information in processed form in the preview?