What I try to do with my projects is keep the process simple. I do my spar layout and build my jig. It's simple if you have the drawing.
I work from the center and the leading edges of my jig meet the leading edge of the ribs. Maybe that will make sense to some.
My next step is glue the ribs to the spar. No big deal hopefully.
That needs to dry overnight. Another little trick for balsa and paulownia bottom panels. I preshape them with window cleaner spray that has ammonia.
It's much easier to work with in the steps ahead.
Oh and we have been getting a little bump. We need more.