Started rudder skins. Work included deburring rudder skin edges, arranging rudder skin support frame, aligning spar to skin and drilling/clecoeing ribs 2-4 to skin (left side only). I found the support frame/alignment difficult and cumbersome. Next step is to attch rib 1. I am somewhat concerned on the next step as my doubler is tight to the rudder sking (length); however, as I can shave the doubler length down with a file, it should not be a huge issue. I also did a quick check on alignment after the ribs were clecoed and it seems aligned properly.