Well finally got back to the drilling process, managed to get all the holes drilled to the bulk heads and mid longerons. Also drilled into my left middle fingertip, ouch, blood everywhere. Bound to happen sooner or later, I was holding pressure on the back side at what I thought was above the hole location oops guessed wrong. Importantly the hole is ok, I'll heal. I'm not 100% happy with the drilling process but its done and I'm not going back.