Established a centerline using colored string and a heavy weight. Clamped the channels and splice angles, and adjusted the overall spar length. Drilled HS-810 and HS-814 to the channels. After clecoing the angles to channel, the alignment of the angles appeared to be a little off ( less than 1/32") so I relocated and re-drilled them, since they will be final-drilled with a #30 bit later.