Build your own LED Meditation Cube/Night Light

Congratulations on your 2016 authoring award with Instructables.com. I’m building a cube but having difficulties with the 3/4" pine in combination with my 1/8" ball nose cutter. I’m looking at your Fusion 360 file now, with hopes that I can figure out how to reduce the material thickness to 1/2". Then I plan to try the same design with 1/2" MDF. Any suggestions on how to approach Fusion 360 to achieve this would be fantastic, as I’m still working my way through the tutorials.