Thank you for asking. The only change I would make to your transcription is to remove the columns of blank cells. They are not necessary. Attached are both a picture and a .brf of the transcription with these columns removed.
You did a great job of aligning by place value and arranging things in a mathematically logical way.
As for the workshop I mentioned way earlier in this thread, in November 2020, NBA's UEB Technical Material Committee presented a workshop entitled “Spatial Problems, Rules And Advice For UEB Technical Material.” A recording of that webinar is available on NBA’s “Web-based Learning” page (in the drop-down list under “What We Do” on nationalbraille.org).