While placing the nose ribs I wanted to make sure the spar was still straight. I had previously placed a string along the forward and aft spars to check for alignment. You can see it image one and two. I check this every morning and periodically while working to make sure the spar hasn't shifted. I placed the second rib in and drilled / clecoed it in place.
The middle rib, rib 8, has to be slotted slightly to fit over the wing strut attaching system. Once that was drilled & clecoed I ran a string through the tooling holes to use for the remaining ribs.