Continued to set up the F842 belly skin to be drilled into the longerons and bulk heads. I could not find my string to make sure the alignment is on the Center Line. After I removed a few more clecos the skin can be manuvered easily and the two alignment holes at the F807 bulk head to align. So I'll get a string and set up the c/l and start drilling the skin to the bulk heads and F818 baggage ribs tonight.