Frame is light and done.

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.