There are a couple things I really like about balsa wood. It's light and it's easy to work. For a long time I was afraid to use it. Mostly because I didn't think it was strong enough. Now I'm feeling pretty good about it's strength.
I sanded the top and bottom panels. It still needs rail strips and the middle needs to be closed up.
The board feels light and strong. It's straight and it hasn't lost any rocker.
My next step is to add the balsa rail strips. That won't add much weight. It feels like this board will be less or about the same as the foam one. That makes me excited.