What do I mean by expandable??
I think anyone will LOVE drawers if they try them, but let's be honest, most drawer setups are expensive, running from $1,500 up to more than you may have paid for your entire rig. That won't do.
So when I stared at my blank paper to begin designing the KISS Drawers mkIII the concept was a module that folks could purchase (1) of, and try it out.
When they were ready, they could buy another, reuse the first one, and bingo: double drawers. Here's a rough animation of what I mean: