Final 3-D plan

He couldn’t figure out how to trick his CNC machine into stopping the wings at 40 cm off the tail, so he just cut them off by hand and had the machine hollow them out.

Mark’s reliance on the CNC machine is to ensure total accuracy though every step of the shaping process. It also allows him to make the exact same board twice, or 100 times, in case you’re reading this and getting ideas.