Walkthroughs for custom maps.

Then you should do it in collaboration with someone. Probably, no one else could do it better than you.
I have serious doubts about the chronological order: the creation date is not known for every map. And it is not always possible to confidently track when certain techniques began to be used: for example, something became possible after the release of a well-known patch for the editor (mainly, object replacement), and it is impossible to know for sure about individual tricks (for example, editing the map file in a HEX editor) based on all existing thousands of maps - when and who first applied them.