Different behaviours in line-final words...?

[Koen G]

This "source document" hypothesis is shaky: it leads us to the conclusion that the source document had the same drawings.

I fail to understand why this would be problematic though. There are so many possibilities. Maybe at some point various versions existed.

Koen: that's exactly the right starting point, though you'd probably need trigraphs etcto avoid going too fine with EVA strokes, e.g. octh.

It sounds like an interesting experiment, and I'd like to do it, only I lack the required skills