Two hours on saturday to fair the vaka's chines. Just elbow grease, rasp, Surforms, sanding board (60 and 120 grit).
Here's a view of the centerboard slot which is a bit uncomfortable to work on due to the tight space. We used the power drill with a grinding bit first, and then rasp and sanding paper.
And here's a view of the stem/bottom junction
Total work time to date: 346 hours.