I cut the ribs at least two at a time on my scroll saw, up to ten at a time if it's a constant cord wing. I use contact cement to glue down the template and give a light score with a exacto knife on the top line then when I cut the two sides with my saw the spar notches just pop out on there own. If not then I just make small cuts on the two lines. I have spar wood that I have sanded and glued sand paper to so it is the correct size of the spars and run that into the slots for a clean finish. Last step is to use my sander to finish the shape of the ribs. With the template still glued onto the ribs I sand them until I have gone into the outside line by about half. If you need photos to make this clear I can cut a few ribs and take pictures. A scroll saw and belt sander are the main tools needed for a plans builder that cuts there own kits. Other builders like band saws, it's just a choice thing.