A coworker of mine wanted to make a card holder for his Shadows of Brimstone
game and needed help getting the outlines done for laser cutting. Overall it wasn't too difficult to get the general thing designed. What was
difficult was ensuring that the cuts for the teeth would fit perfectly for the side panels. Since there was so much interlock there, you had to make sure you could manipulate and visualize the whole thing on a 2D plane, while rotating it in 3D space to catch the holes.
Needless to say it worked out the gate and I'm pretty stoked about it. Not that I play the game or anything, but that it worked on the first go.