It appears one or two have been built. The Open Book project is floating around in the air.

Does it offer anything?

The downside is Moonreader+ pro probably won't run on it. Calibre will run on a Raspberry Pi and it does have an ereader.

Thoughts?

Thanks John
Considering how small the Pi Zero is I can see how it's possible. For whatever reason the linux based handheld game players and linux based watches have no appeal to me. But an ebook gizmo could be interesting.