I’m not sure I understand, epub is both the industry standard and an open format, as far as I know. Why not work on using it or build it around epub from the get-go?
I have to admit I’ll have to wait for the project to start implementing epub to consider getting on board, but it’s still a great effort.
To be fair when it comes to this kind of research comparison with modern hunter gatherer societies is the closest thing you can find to evidence, some things never enter the archaeological record.
Perhaps we’ll never find conclusive evidence pointing to any one of the theories on these missing-finger handprints.