Bock #6 nib assembly in clear cast acrylic is complete. This one has a steel Bexley nib.
I’m also reverse engineering a Bock #6 with a titanium nib borrowed from Newton Pens. The feed design is different because the nib has a different curvature than the steel Bock nib. The housing is also a little different, but it still fits existing pens that accept Bock #6 steel nibs.