DIY Sanding Disc Holder from scraps/free wood

The idea is that the different grits each get their own shelf. I made this out of some scraps and free offcuts I got from Home Depot.

I bought a cheap table saw a while back but it's been too wet to use it before now so this was my first time using it. I routed the dadoes in a 1x8 then ripped it into the three pieces. Surprisingly, I still have all my fingers and toes after this.

Each shelf is stopped from coming all the way out by a cap-head screw and acorn nut.

Unfortunately, the dadoes are too big (I have 1/8" (too small) and 1/4" (too big) router bits; I need a 3/16" bit) so they don't slide into the rear dadoes the way they're supposed to. You can see this on the third shelf from the top. I still like the idea, even though I clearly don't have the skills needed to execute it properly.

Ironically, I forgot to sand everything before putting it together. Yay me.