Then I started fitting my daggerboard into the case. Here's the (not yet fully faired) board sticking out the top:
Here's the "A" daggerboard section traced out on the bottom of the case:
The poured-insert turned out pretty thick. All of the chopped glass I added to the mix settled to the bottom of the insert though.
The hole turned out to be too small (I was worried it'd be too big), and I had to gradually enlarge it. I tried various tools but finally settled on a round rat-tail file. This was good for increasing the opening while keeping the curves nice and even. To be honest, there's not much left of the insert by the time you get to this point: