As I expected, it doesn't seal very well so I have to fix that. Not a biggie. Made the first tray out of solid Spanish Cedar:
I chose the slat design because I want the humidity to be able to transmit from tray to tray. They're slightly larger on the walls. I'm removing the bottom drawer for boxes. Here's a better shot of the old MDF tray. They have a very thin veneer on it. Even the bottoms are MDF with veneer:
