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It would be great if we could all start working on this right away, as I said before. But it will be faster if we first decide on the format. I suggest using Excel as a base, taking "Physmig 3" as a model.
As a result, we will first have this Excel file with empty sections and subsections. We will post this file in this thread, and those who are knowledgeable about a particular section (for example, the Artifacts section, the section on the tactical aspect) will be asked to work on it.
It would be better if ONE person covers ONE specific section. Because, for example, if someone writes about the Academy, someone else about the Asylum, and a third person about the Necropolis, we will end up with three different perspectives and approaches to the Undead section, and in a good textbook, each section should be consistent in its own style.
Now we need a coordinator, i.e., someone who will create this initial Excel file. He will post it here. Then we recruit people to the team for each section. They download this initial file and work on it in their respective sections. Then each person sends their work to the coordinator, and he checks, supplements, makes comments, etc.
Then this "raw" textbook with the sections already filled in is posted for general discussion. And again, we identify errors, make additions, etc.
I think this option is more dynamic in terms of development; everything will depend on the conscience of the coordinator and the participants.