If you don't have experience working with tools or building FORGET IT. MOVE ON.
Materials extremely cheap, measurements off. I can't imagine these holding up for the long run or the shelves not bending.

Let's not forget that Wayfair had to ship a replacement unit because one arrived broken. I haven't opened the other 3 boxes yet but will not be surprised if they are also broken.

On the bright side Wayfair was amazing and sympathetic about replacing the broken unit.