A beautiful ePub Alex: bravo!
Have you thought about a version adding the ancient Greek and Latin texts?
I'm kidding!
I try the epub with my Kobo Touch and indeed the endnotes work on a random basis, even if the font-size of the .fn is set to 100% and vertical-align to baseline. Greater than this (100%), the epub is less harmonious.
This problem is probably related to the touch screen of the Kobo, less precise for example than the Sony PRS-T1 which can use a stylus btw.
On the Android side, have you ever used Moon+ Reader? The free version is working very well to me.
Thanks for the ePub Alex, and have a nice day/evening.