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).