Just a few things on the DIY rack that you may want to consider...

The bottom shelf is double thickness to support the threaded rods.

You can't see them in the photos, but I used heavy duty casters on the rack so I can pull it out from the wall for easy access to the back.

Only the bottom shelf has washers on both sides of the shelf, the other shelves only have washers on the bottom.(I thought it looked better that way)

Oh, and paint the rods after it's put together!