a beautiful boat should sail forever.
Re: Masthead fitting. I have always liked the "crane" atop moderns masts which project fore and aft and house the sheaves for main and foresails. They are sturdy and have a platform on top to which one can attach wind direction and speed transducers, passive "windicator", lights--both anchor and strobe, antennas, lightning rod and static dissipater, etc.
Attached is the drawing which we made (not to scale). Dimension are specified and after installation, viewed from multiple angles distances (even though still horizontal), it looks gracful and functional. I am a little worried about mast stepping and keeping it clear of the hoisting cable.