Thanks for all the very kind comments.
In response to a few questions, The nib/grip section is a Berea section used in El Grande and Churchill type pen kits, also available separately. The only other premade part is the clip, which in this case was pilfered from a flattop american style twist ballpoint. The threading was all done by hand on my wood lathe with tap and die (with the exception of those on the nib section, which I didn't cut, only chased to deepen).
EDIT - sorry, almost forgot to answer Re the cap finial - the piece of golden dawn resin in the cap finial is an inlay, not a tenon.
Must say, thanks, Ed! - your blanks are excellent!
Ken