Fusion360: Automatically sized finger-joints

I recommend viewing the newer video at https://youtu.be/XoDbBkgv33U after viewing this one. A newer version of this model is now available at https://www.thingiverse.com/thing:2839125 In this video I design an open-top box with finger-joints for cutting on my Glowforge laser. The size of the fingers in these joints automatically adjust based on the dimensions of the box and the number of fingers that I want to have on any given edge.