From a quick skim of the site, seems like the intent is that the machined parts would eventually be prefabbed at quantity and you'd purchase the required parts.

From a quick skim of the site, seems like the intent is that the machined parts would eventually be prefabbed at quantity and you'd purchase the required parts. Compare "machining a single Lego out of plastic" vs "buying a bag of 100 1x2 plates, and one of 100 2x6 bricks".