We had some book shelves fall apart and I did not just want to throw it all away. I has some spare pvc lying arournd and decided to merge the two into working bookshelves. The self on the right is just like what the old shelf looked like. The new shelf holds just as many books. One thing I knew but did not express was that these units are very portable and would be easy to break down if you had to move. Something you could not do with the original units.
Step 1: What's needed.
Shelves from the old bookshelf or you can get them from the local hardware store.
4 pvc pipe lengths. s/b under 2 bucks apiece.
Pvc ends would make it look nicer but not required.
at 4 sets of screws, washers, and bolts for each shelf.
Dril (a drill press would be better) with bits the size of the diameter of the pvc and for the screws.
C-Clamps (which I do not have).