I used ss drill point self tapping screws to tie the back of mine to the rails. The right hand rack is holding a fair bit if weight.
I was referring to the shelves themselves. except for the drawer they are 2u ventilated cantilever shelves with the larger side panels. I used 8u perforated spacer panels for the top of each rack.
I finally got through the improvements list for the room and could now focus on to the desk build. The plan is to cantilever the desk supports to the wall and possibly add a shelf or two. Let's see how it goes this weekend - Stay tuned! https://www.qrz.com/db/n3kae 73 - N3KAE