This is what started it.

I've no idea what to do with it yet.

Perhaps it's a sign as to how my wife has got used to me. I hadn't even so much as looked at this drawer when she suggested building a layout to fit in it.
It's 20" x 19" (or 582 x 508mm in metric). It's a quality drawer, nice solid wood with well dovetailed corners and a solid plywood base. The base might not even need too much bracing to support a layout in there.
Right now I don't have much idea of what to do with it. I have some ideas and I'll share those later. But right now this empty drawer is a blank slate.