The wings will be constructed one at a time as per the instructions (right, then left). I went ahead and made both spar extensions at this time, since it was easiest to just transfer the measurements from one to the other while I was at it. The plans took awhile to decipher and figure out how the wing extensions attached to the wing. The hardest part was figuring out where to measure from when placing the upper/ lower spar cap angles and "L" angle stiffeners.