Not too much accomplished today. I removed the upper aft fastback portion of the fuselage in preparation for deburring, dimpling, and priming.  

There is a slight ripple visible in the aft skin. You can see it in the shadow line near the middle of the photo below. Its very obvious when the skin is laid flat, but when you curl the skin it is almost nonexistent. I’m not worried about it, but I’m curious as to how it got there. Somewhere in the installation process, as I don’t believe it was this way when it arrived.