Rear Spar Assembly

I found the wood cutting bits to work well on the thin aluminum spar channel, here cutting  the hole for the flap pushrod in the rear spar. I put both rear spars together and drilled them at the same time.  A little touch up with the sander made quick work of getting the oval shape. The next shot shows the splice plates for the spar and the next picture shows the end pieces. Following the plans I drilled pilot holes for all the ribs. Afterwards I realized that the ribs already had pilot holes in them. Luckily they matched very closely and by the time I had drilled them up to 1/8 for the rivets, this was not a problem... Also shown in the last shot are the angles for the aileron bellcranks.