I'm thinking of making a 150-200 ct. humidor. I was inspired by a wine crate I saw and I've decided to use 3/8" formaldehyde-free cabinet grade plywood for the whole thing. The cost is not prohibitive, seeing as a sheet is $40-60, and thats enough for probably 2 humi's if I'm careful. The box would have outside dimensions of 11.5"x12"x20" Here's the inside with a view of the bottom. These dividers would be removable for boxes. However, they are spaced appropriately for a 25 ct. box in each section. The spaces between dividers are about 6"x5"x9". Also, for humidification, a false back wall is included. It has 6 long vertical holes for airflow to all the lower and upper sections. The beads would hang in bags behind the false wall. The first singles tray sits above the box storage area. Its 1.5" deep, but has a 2" lip on both ends to allow space between the singles trays for airflow. The lip would also allow for stacking singles. The second singles tray is the same as the first, except it has a hole in the middle to allow the handle from the first tray to come through to grab. If anybody has any criticisms please share, so I can improve my design. Thanks!