With a bit of further reading and some confidence building after my first set of kerfs on the starboard side of the centreboard I’m back to work on the port side.
After removing the bulk of the material with the power planer, I switched to the small block plane which seemed to work better than the larger plane with the cedar and the curves. It also is pleasant to work making almost no noise and creating nice wood shavings and no dust.
For the transition to the part of the centreboard that pivots I need to use my random orbit sander with 60 grit. Ideally I’d like to use a disk sander or a belt sander.