After seeing this:
I lurked a bit into the seiko mods and after marveling at [mention]Emilio[/mention] ‘s 3D modeling skills and his mention of shapeways I expanded a bit on what I mentioned a few posts earlier in this thread.
Why not turn down an existing bezel in diameter and height and 3D-print a „sleeve“-bezel in metal to sit ontop of it. This could be soldered/ tig-brazed/ whatever in place...
This way the machining involved is down to making the „sleeve“ fit over the original bezel. No issues concerning water resistance, making the bezel click, etc.
I took some measurements and Emilio agreed to design an Egi bezel to fit ontop of the Seiko SKX that will be fitted with a top hat crystal to gain some bulk. Overall diameter without crown will be 43mm... a micro-Egi
It would be considerably easy to adapt this to the Zerographe as well as to different cases (Tudor black bay no cg for example). Considering the quality of the 3D prints (they even do lost wax in non ferrous metals) it could be a fun way to get there without the need for a five axis milling machine...