It's important for me to build a strong frame that's light. The final outcome was about what I expected. The spar and ribs came in at a little under a pound. The first and last ribs were made from paulownia instead of the luan to keep them lighter and stronger. That saved 10 grams.
I did a dry fit and everything looks good so far.
My next step is to make the bottom panel. It will be mostly balsa with some paulownia added for strength.