I needed an organizer for compact discs for a cabinet I was building and none of the off-the-shelf ones I saw fit my requirements. Naturally, I did what any full-blooded Instructabler would do: I built my own at the Tecshop, http://www.techshop.ws. The overall dimensions were fixed by the shelf available and I wanted to maximize the space I had to work with.
The first order of business was to measure a stack of five CDs in standard cases. I added a bit to the width and a scoatch to the stack depth and that established the "pocket" size. I had decided to use 1/4" MDF for the four sides and two column dividers and 1/8" MDF for the row partitions. After hand sketching my plans I did the parts layout in a 2D graphic program I have used extensively, DeltaCad 8. The finger joints, interlocking slots and slot and & tab dimensions were based on the material dimensions.