Cool. I see there is one column just with the numbers. Please add 3 more columns: one without the capital letters and numbers (leave empty spaces where they were), one without lower case letters (just capital letters and numbers, on their respective places) and one just with the capital letters on their position. My guess is that these are the "layers" of the palimpsest.Mach10 talked about palimpsests and blueprints like in the Iron Man movie, so my guess would be 3D (several layers stacked vertically) instead of alternating rows on a piece of paper. Numbers that appear in the text are 012 456789, so I'd guess 8 layers on top of the base.
Sort of like this:
View attachment 130893