Dream humidor construction in progress- help?!

So to give everyone an idea of where this is heading... on top of this goes another section the same height as the middle, which will have a catch and room for 3- 2 inch deep trays, then an inch thick 4 sided "breadboard" top with 3/4's inch recess and grate for upper humidification, and will have both a lock and a magnetic seal to be extra tight...

The bottom tray catch also leaves 3/4's an inch room for lower humidification as well...

another buckle latch will join the middle section to the top and the next section will have recessed handles as well...