The elevator spar has two tapers - one on each end. Holes were drilled to accept the trailing edge tubing. Once the holes were drilled, they were cut on the line.
You can see the finished result below. The birch plywood was cut into strips for the ribs. Each rib tapers from the spar thickness to 1/8 in at the trailing edge. The two large ribs taper on both ends! 1 1/8 in at the spar, 1 3/8 in the middle and 1/8 at the end.
Most of the ribs are cut. I'll have pictures when they are done on the next blog. I ran out of time today.