Summary

Parameter - 4 -5 to make it Tough

I add sketchup files (skb)

Add felt pad or rubber pad in the bottom of the leg, for anti slide.

You will need 3/4" wood shelve. if the shelve is too long, you will need
to print the "LEGs" for the middle or more for the not to sag down because
of the weight in the middle.

if screw is too big, you will also have to enlarge the hole a bit more, but remember
you hole parameter is only about 4-5 walls. (you may ad if you want)