I've posted about this before, but it still fascinates me. i've been watching all of his videos on this project since the start, and it's amazing watching it come together. Even the 30 minute videos talking through problems with CAD and cnc router bit size complications.
Check out, say, 11:04 for some plywood mechanical porn, after "slaying" a engineering metaphorical "dragon":
Make no mistake, it's still far from done (he hasn't even started attaching/building any of the actual instruments yet), but still amazing.