Marking the stiffeners

Here is a series of pics that shows the various markings to be made in order to trim the stiffeners from the aluminum angle. You can see the semicircle notches that Vans made and the lines drawn to connect the marks to create the correct trim lines for each stiffener. The only thing I did not like about this process was that Vans attempts to show this in their plans with the angle drawn "flat". They say this is for "clarity," but I found this to be quite confusing. They really need to show a better diagram so that you can understand how the trim lines need to be drawn. Nevertheless, I managed to figure it out.