Originally Posted by
Ben Ellenberger
The top is a panel. I cut a groove in it, with the bottom edge of the groove sized to fit into a groove in the box. So the spacing of the groove in the top of the box and the spacing of the groove in the panel have to be just right for everything to fit. Also, after cutting the groove extra deep in the panel, I cut the bottom edges that fit into the box back. So, the “tongue” that fits into the box is only about 3/16, while the top edge overlaps about 3/8 or so (I forget exactly how much).