I like the ideas as well, but , what is the target group of this service??

If it is for people on boats, then they will get access to internet on their return from voyage, or at the nearest port of call to download the books, or they will already have them downloaded.

If you want to use it while you travelling, then you will have to leave it somewhere stationary to download the data and in that case, you can not travel during that time, and you will have to know what is being downloaded so you can plan accordingly your trip with stops etc.

If it is to be used by people in the remote parts of world, then I think that it would be useful it would contain information that could be relevant. While I agree with everyone and as Tony B. once said, Education, Education, Education, the chance of someone trying to read Faust in German may be bit slim, but please correct me if I am wrong.