It looks like the finish is super sweet, and the whole idea is off the charts, but i personally don't care for the size and shape. You mentioned using 7MM tubes? How thick are the walls of the pen? Were you constrained by the final diameter of the nib? I think a matching brass centerband might help with aestetics (sp). or maybe a longer thinner nib?
And i think technically, A "finial" that is at the bottom of the work would actually be a "foot". Considering most pens have some sort of something on top, it is confusing to call the "nib" a "finial". I don't know that much about the technical verbage for ink pens, these are just my thoughts.