Today I began the fuel tanks. First I marked the centerlines on all of the T-712 angles. Then I found the exact center of each angle. Finally, I drilled 1/8' holes at the center of one flange of each angle and a #12 hole at the center of the other flange of12 of the 14 angles. I drilled the holes using the drill press.
I then clecoed the angles to the spars, clamped them down and match drilled all the holes to the spar. The came out really well! I then deburred all of the holes.