Custom Desk organizer/drawer system

In need of some organization on the antique architect table that I use as a desk, I created a drawer system (reminiscent of a roll top desk) out of some vintage, steel card sorting drawers picked up from a local, and some salvaged boards from the shed my neighbour had to tear down earlier this year. To finish off the interior, I add some drawers salvaged from an old, Singer sewing machine table dating date 75 years.