Cabin top winch mounting boards
I don''t know of pre-manufactured ones. I had the same problem with my Islander 30. I wanted to lead all the halyards to the cabin top from the mast. I made up bases for the winches and traveller bridge by using cold cure epoxy. A Peanuts can was the exact diameter and once the cold cure had hardened I gound out the curvature of the deck with a belt sander. Works very well and the cold cure holds a color dye well (black). No maintenence! Don''t forget to wax the can before the pour in the cold cure....