Nicola, What a lucky you are that your mom took you to Hungary. I were just few days in Budapest, long ago, but I have to come back soon because I liked it very much.
I wouldn't make it wider that 12. The maximun I have built is 30 cm wide (= 11.8 inches). In the picture of the instructable you can see at the botton shelve, just in the center, 12 big (art history) books that have lasted there more than 5 years without problem.
But use a thick hard wood for the shelves. Otherwise it could be that they bended down.
Good luck.
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Comment: Wonderful work!!! Thank you so much for posting the pictures!!! Spread the word.
Comment: Congratulations!!!Very nice work. Very nice picture.Very nice comment.Thanks a lot
Comment: Bravo!Wonderful work.I like much your low table solution for the shelve at the bottom. …
Comment: Hi, Hi,Yes and Yes.There are solutions at the comments for drywalls.Basically it consis…
Comment: Thank to you for your comment but post pictures of your set up whenever possible.