Jon Danniken fired this volley in
:

One panel slides in front of the other, so
it's basically two panels deep.

Yup... and as long as each 'forward' layer has one fewer racks than the
back layer, you can make them any number deep. Since they're only about
4" deep, I could get all six in a space 48" wide by 24" deep -- about the
size of our larger toolchests. So it doesn't have to occupy a whole wall.

Lloyd