There three pictures show the close up of the rear spar clamping. Dont want to get too heavy so as to distort the flange on the spar and skin, or put marks in the skin by the rear spar support angle. Both were placed at the rib position for support without bending. the third image shows the middle shim held in place with the usual red tape. just a snug fit here was all that was necessary to prevent flexure in the middle while drilling. Seemed to work
As I leave tonight, the next step will be drilling to 1/8 inch, cleaning things up and reviting.
After that will be another LE bend up/bag up situation. I will of course take more pictures.