Sawtooth Rail Fence

After sewing all those little triangles together, here is the next step.  

Dark strips on the dark sides of the triangle sets. And then, 

light strips on the light side.  That gives you a completed block. Next is sewing the blocks together.

A dark strip horizontal, then vertical.  

The next row starts with a dark vertical, then horizontal.  I hope that makes some sort of sense. I had to be very careful not to sew them together the wrong way.  

I'm doing six sets of 20 blocks, then I will sew the sets together. It's a little more manageable that way.