Lots of errands today, but I did get into the shop to do a little. I got the last rib formed and fluted. Tomorrow, after moving MORE snow, I'll fit the ribs and hopefully get the lightening holes drilled.
Here are three Youtube videos of the process I used to make the ribs:
Video 1: https://www.youtube.com/watch?v=rUyTOwfnQiI
Video 2: https://www.youtube.com/watch?v=xklhaKkfCzk
Video 3: https://www.youtube.com/watch?v=GhuhLJXEWr8