I went 25% infill but you could go solid if you want and it wouldn't add much more print time. I found having negative space in the center of the bracket cause items sitting on the shelf above to be unstable. So, I went with a full plate and 1.75mm thickness to have strength but not make the stuff sitting on the shelf above it sit tilted.
Use M5x25 bolts and nuts to attach it.
The author remixed this model.
Not even sure if this counts as a remix, it is more like a mod to go with the original Ryobi Tool holder. Just allowed me to add it to the underside of my wire shelf.