Sanding and bottom edges on kaholo

So this is my first wood working project. The book doesn’t quite explain how far to sand the hull edges or chines if I’m supposed to see a little of the fillets or rounded enough and fill in the channel between the two edges of plywood (so far I don’t see any gaps. ). Thanks for any advise!

   I just checked out the construction photos of a kaholo and was pretty surprised at the complexity. Not just a board you stand on at all. If I understand your question,the edges should be rounded to give a nice smooth curve. If you get to the fillet underneath, youve gone too far.

that’s what I would think. Just enough to where the FG can be smoothed over the edge