Those all sound like good advice. For me doing a disassembly, I find it helps to not only take lots of pictures, specifically trying to capture the initial state of each item/assembly being documented, but also to take the time while the memory is fresh to rename/title and save the pictures to indicate before or after, as well as what the point of the picture is taken to capture.
Examples include details like the presence of the internal oil line under the engine side cover that is part of the oiling pathway to the rocker system on the head, or closely checking each item as removed.
On the "Bag everything" note, be sure that includes a tag of some sort, preferably inside the bag or at least securely attached, that details the contents of the bag and where it came from on the engine. Adding a note about the condition would be helpful when it comes to rechecking your bags for what is still good and what may need repair or replacement. That can help you begin gathering information for identifying/locating/ordering needed parts.
Also highly recommended before you begin the tear down process, read through the Legacy Tech Tip
261 Rebuild which has some extensive knowledge sharing and helpful tips & suggestions.
Looking forward to seeing and hearing more on your 261 and progress on the project.
