4
Your main issue is the large span for the shelves. Plugging in your dimensions into The Sagulator gives a sag of over 1/4" with pine, a tad under 1/4" with oak and around an inch for particle board or MDF.
The easiest way to reduce the sag is to have more support for the shelves. Even a single support in the middle (which reduces the span from 85&...
2
There are a lot of issues to consider in this project.
It is not clear how much experience you have nor what tools you have to work with so it is difficult to give specific advice on how to proceed.
The shelf layout limits the height of books you can store. You may want to consider varying the height of the shelves such that one shelf handles taller books ...
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