Modular Rack System for Altoids Tins

Do you use Altoids Tins to store things? Want to keep them in a neat little rack system? You can stack the racks pretty much however you want. Put them on your desk, egg-crate style, or mount them to a wall, cubby-hole style. I tried to make this sturdy enough to assemble while using as little plastic as possible (and no support needed).