So, just to clarify, you want us to update on the first friday of each month or update on the first saturday of each month (or on the day before the first saturday of the month in case the 1st of the month actually does land on a saturday)?
From UBSR law §3.2.1:
Collective storages must be registered in this document, and their manager must update the document so that it shows the correct values the first Saturday (UTC) in each month.
This means it would be a good idea to update it on Friday, and change it during the Saturday in case you move stuff in/out of the storage that day.
In practice I will be copying the values probably around 9:00 UTC, plus/minus some hours. You can see the dates in the first row of every sheet in the Google document. If I've already filled the column with the specific date, there's no need to update it before next month.
If you see I've copied the data and you didn't update it you can still update it and then tell me, then I will fix the values, but I would prefer if everyone remembered to keep their stats updated for when I copy them on Saturday.
Also, if you're going to list every possible thing, you're missing poisonous potato, though they really have no use right now.
I'm not, it would be impossible to list all the millions of potential fireworks rockets, different colors of leather armor, enchanted tools etc. Because of this I've excluded certain items, which I think the item library system works better for.
I've considered adding unenchanted diamond tools and iron tools though.
I've also considered whether we should allow people to store maybe a limited amount of certain items (like enchanted tools) in private chests without using the item library system, I'm not completely sure about this idea.
For bookcases and books, do you want to count the books stored in the bookcases themselves?
What do you mean by this? Can you store books in bookcases? As far as I know, there are bookcases which are blocks, which would simply be blocks when you've stored them in your collective storage, the same way as a chest inside a chest can't hold items. If you mean the books (items) that the bookcase is made of, no, because there is already a cell for the books, so that wouldn't be needed.
This is just an opinion, but shouldn't the totals be AFTER the things that it is a total of? I'd understand if you have to rearrange a whole bunch of equations if you were to change it.
I put them before to have it work the same way as the categories, as a sort of headline before you see all the different clay types etc.