I have been finishing the floorboards with Danish Oil. It is slow work. Because the stuff is stinky I have to work in the cold garage, so the Oil needs a long time to dry. So far about half of the floorboards are installed, and the rest need one more coat of Danish Oil.
I also finished the centerboard trunk with several coats of clear water-based polyurethane. People will be able to look at it and know for sure that this is a wooden boat!