At the suggestion of some in the "C & V - What's it Worth" subforum who have asked me to cross-post, here's some pics.
These may better detail the construction of the Cosmopolitan frame and how Harlan put it and some of his other components together.
The headset is "threadless" and uses the same sealed bearings as the bottom bracket.
The frame is fully internal-cable-routed and poses no interference in steering due to the use of tiny tubes for the cables inside the over-sized head lug.
IMHO Harlan was years ahead of his time with the oversized headset, bottom bracket, internal cabling, sealed bearings, pedal design etc.


- and yes, I know this is a "zombie thread" but I think keeping the info here in one place makes it easier to find.